Sound Change Game

[CatDoom]

Wastelandic Zarcosian hïjwiē [hɨʑˈʋʲɛi̯] Bol Ou iwé [iˈwe]
Wastelandic Zarcosian šïjwiē [ɕɨʑˈʋʲɛi̯] Bol Ou šiwé [ʃiˈwe]
Wastelandic Zarcosian kënriêr [kənˈɻʲəɯ̯̽ɻ] Bol Ou kaúyau [kaˈu.ja.u]
Wastelandic Zarcosian wëtšrâ [ʋəcˈɻɑɯ̯̽] Bol Ou wapúa [waˈpu.a]

[Matrix]

How did you get [p] from [c]?

[CatDoom]

To make a long story short, first it debuccalized to a glottal stop, and later there was an unusual change in which a glottal stop followed by /u/ and a second vowel was replaced with /p/.

[Nortaneous]

Bol Ou iwé [iˈwe] Raston Arve ive [ɪˈⱱei̯]
Bol Ou šiwé [ʃiˈwe] Raston Arve stive [çɪˈⱱei̯]
Bol Ou kaúyau [kaˈu.ja.u] Raston Arve koljy [ˌqʰɔu̯jʏy̯]
Bol Ou wapúa [waˈpu.a] Raston Arve verpoh [vɐˈpʰuə̯]

[xroox]

Raston Arve ive [ɪˈⱱei̯]→ Tnaap iwai [ʔɪˈβɛː]
Raston Arve stive [çɪˈⱱei̯]→ Tnaap ihiwai [ʔɪʝɪˈβɛː]
Raston Arve koljy [ˌqʰɔu̯jʏy̯]→ Tnaap kauju [ˈkɔːjʊ]
Raston Arve verpoh [vɐˈpʰuə̯]→ Tnaap wahquuha [wəhˈkuːwo]

[Dezinaa]

Tnaap iwai [ʔɪˈβɛː] Yiingim ’ipáí [ʔīβéj]
Tnaap ihiwai [ʔɪʝɪˈβɛː] Yiingim ’ikipáí [ʔīʝīβéj]
Tnaap kauju [ˈkɔːjʊ] Yiingim káúiu [kówjū]
Tnaap wahquuha [wəhˈkuːwo] Yiingim ua’kúúa [wōʔkúːō]

Did you change the name of your conlang, xroox, or was Tnaap a typo?

[xroox]

Did you change the name of your conlang, xroox, or was Tnaap a typo?

The vowel <y> /ɨ/ is mostly epenthetic. In one dialect it is inserted to break consonant clusters like the one in Tnaap. But I think another dialect could solve the cluster in a different way:
/tnaakʷ/
Dialect A: [tɨˈna͡ɔp]
Dialect B: [tɾ̃a͡ɔp]
Since not every dialect inserts <y> in that case, I think the best spelling would be Tnaap.

[CatDoom]

Yiingim ’ipáí [ʔīβéj] Proto-Coastal-Western ʔìbeľ [ʔìbéʎ] Bol Ou íibei [ˈiː.be.i]
Yiingim ’ikipáí [ʔīʝīβéj] Proto-Coastal-Western ʔìğìbeľ [ʔìɣìbéʎ] Bol Ou ikíibei [iˈkiː.be.i]
Yiingim káúiu [kówjū] Proto-Coastal-Western koljù [kóɫjù] Bol Ou kóuyu [ˈko.u.ju]
Yiingim ua’kúúa [wōʔkúːō] Proto-Coastal-Western wòʔkuwò [wòʔkúwò] Bol Ou wookúwo [woːˈku.wo]

[opipik]

Bol Ou íibei > Project Tectite ípai
Bol Ou ikíibei > Project Tectite ikípai
Bol Ou kóuyu > Project Tectite kauju
Bol Ou wookúwo > Project Tectite pakupa

[Nortaneous]

Project Tectite ípai Kannow ep'eja [ʔɛˈpʼeʑæ]
Project Tectite ikípai Kannow eceep'aja [ʔeˈcʰeepʼaʑæ]
Project Tectite kauju Kannow k'agòw [ˈkʼɑɣəw]
Project Tectite pakupa Kannow p'akòpaw [pʼaɔ̯ˈkʷoə̯ɸɑw]

(fricatives are in free variation with voiced or aspirated stops)

[xroox]

Kannow ep'eja [ʔɛˈpʼeʑæ] → Tnaap aiqaisai [ˈʔɛːgʷeʒe]
Kannow eceep'aja [ʔeˈcʰeepʼaʑæ] → Tnaap aikaiqasai [ˈʔɛːd͡ʒegəze]
Kannow k'agòw [ˈkʼɑɣəw] → Tnaap kakau [kəˈgɔː]
Kannow p'akòpaw [pʼaɔ̯ˈkʷoə̯ɸɑw] → Tnaap qaaqauhqau [ˈkʷa͡ɔgʷohkʷo]

[CatDoom]

Tnaap aiqaisai [ˈʔɛːgʷeʒe]
→ Wendoth įbezh (Nom.), įbezhų (Acc.) [ˈḭbəʒ], [ḭbəˈʒṵ]
→ Yewedu bē (Nom.), bezu (Acc.) [bɛː], [bɛˈz̪u]

Tnaap aikaiqasai [ˈʔɛːd͡ʒegəze]
→ Wendoth įjhehez (Nom.), įjhehezų (Acc.) [ˈḭd͡ʒəʁəʐ], [ḭd͡ʒəʁəˈʐṵ]
→ Yewedu jehē (Nom.), jēṛu (Acc.) [d̪z̪ɛˈɦɛː], [d̪z̪ɛːɻu]

Tnaap kakau [kəˈgɔː]
→ Wendoth qehau (Nom.), eqhauų (Acc.) [qəˈʁaṳ], [əqʁaṳˈṵ]
→ Yewedu kû (Nom.), kûhu (Acc.) [kṳː], [qṳːˈɦu]

Tnaap qaaqauhqau [ˈkʷa͡ɔgʷohkʷo]
→ Wendoth paubãp (Nom.), aupbãpoų (Acc.) [ˈpaṳbɑ̤p], [aṳpbɑ̤ˈpoṵ]
→ Yewedu bâp (Nom.), bâpū (Acc.) [ba̤ːp], [ba̤ːˈpuː]

[äreo]

Msěrsca (from Wendoth's nominative):

ibes [ˈɪbɛs]
iděhes [ˈɪdʒɛxɛs]
cahao [kaˈxao̯]
paobop [ˈpao̯vop]

[ęzo]

ibes [ˈɪbɛs] → Ancient Vitran ibes [ɪbes] → Classical Vitran yve [ǝfe]
iděhes [ˈɪdʒɛxɛs] → Ancient Vitran iddexes [ɪddexes] → Classical Vitran ydehe [ǝtexe]
cahao [kaˈxao̯] → Ancient Vitran kaxau [kaxaʊ̯] → Classical Vitran kao [kʰaho]
paobop [ˈpao̯vop] → Ancient Vitran paubop [paʊ̯bop] → Classical Vitran povop [pʰofopʰ]

[Nortaneous]

Classical Vitran yve [ǝfe] Hathe êvi [ʔǝvi]
Classical Vitran ydehe [ǝtexe] Hathe êteki [ʔǝtə̥ki]
Classical Vitran kao [kʰaho] Hathe kahu [kaɦu]
Classical Vitran povop [pʰofopʰ] Hathe vovove [wowovǝ]

[Nannalu]

Hathe êvi [ʔǝvi] Ttɯŋjṹol ʔé bi [ʔe˦ ^mbi]
Hathe êteki [ʔǝtə̥ki] Ttɯŋjṹol ʔé tẽ́iki [ʔe˦ t̪ẽ˦ki]
Hathe kahu [kaɦu] Ttɯŋjṹol kàu [kau˨]
Hathe vovove [wowovǝ] Ttɯŋjṹol ouó ba [owo˦ ^mba]

[Nortaneous]

Ttɯŋjṹol ʔé bi [ʔe˦ mbi] Zzyxwqnp yetbbi [jéⁿbī]
Ttɯŋjṹol ʔé tẽ́iki [ʔe˦ t̪ẽ˦ki] Zzyxwqnp yettentky [jétéɴkʒ̩̄]
Ttɯŋjṹol kàu [kau˨] Zzyxwqnp kapwup [kàwù]
Ttɯŋjṹol ouó ba [owo˦ mba] Zzyxwqnp wowotbba [wōwóⁿbā]

[finlay]

Zzyxwqnp yetbbi [jéⁿbī] Yaufulti yenpi ["jembI]
Zzyxwqnp yettentky [jétéɴkʒ̩̄] Yaufulti yetenkizi [ye"teNgIdZI]
Zzyxwqnp kapwup [kàwù] Yaufulti kagu ["kago]
Zzyxwqnp wowotbba [wōwóⁿbā] Yaufulti gugunpa [Gu"Gumb@]

[Zaarin]

Yaufulti yenpi ["jembI] Silk Weaver yìndi [jɛ̀ⁿde]
Yaufulti yetenkizi [ye"teNgIdZI] Silk Weaver yitìlcingi [jɛtɛ̀lt͡siⁿd͡zi]
Yaufulti kagu ["kago] Silk Weaver càngu [kɑ̀ᵑgo]
Yaufulti gugunpa [Gu"Gumb@] Silk Weaver ngungùrca [ᵑgoᵑgùɾkə]

[Pogostick Man]

Silk Weaver yìndi [jɛ̀ⁿde] → Proto-Avestan *jende → Avestan jenl [ˈjenl ~ jenɾ]
Silk Weaver yitìlcingi [jɛtɛ̀lt͡siⁿd͡zi] → Proto-Avestan *jeteɾciɲɟi → Avestan jetersiñz [ˈjetɨɾsiɲz]
Silk Weaver càngu [kɑ̀ᵑgo] → Proto-Avestan *kaŋgo → Avestan kaǹ [kɑŋ]
Silk Weaver ngungùrca [ᵑgoᵑgùɾkə] → Proto-Avestan *goŋguɾka → Avestan oǹerc [ˈoŋɨɾk]

[xroox]

Avestan jenl [ˈjenl ~ jenɾ]→Tnaap iar [jɛɾ]
Avestan jetersiñz [ˈjetɨɾsiɲz]→Tnaap jatyrsins [ˈjɛdɨɾzɪɲs]
Avestan kaǹ [kɑŋ]→Tnaap kan [kan]
Avestan oǹerc [ˈoŋɨɾk] →Tnaap aunyrk [ˈʔɔnɨrk]

[Pogostick Man]

Tnaap iar [jɛɾ] → Kgáweq’ yer [jeɾ]
Tnaap jatyrsins [ˈjɛdɨɾzɪɲs] → Kgáweq’ yítǝrsinis [ˈjidəɾsinis]
Tnaap kan [kan] → Kgáweq’ kan [kan]
Tnaap aunyrk [ˈʔɔnɨrk] → Kgáweq’ ’únǝrǝk [ˈʔunəɾək]

[CatDoom]

Kgáweq’ yer [jeɾ] → Doanu Lukpanic iel [ˈi.el]
Kgáweq’ yítǝrsinis [ˈjidəɾsinis] → Doanu Lukpanic idelesinisi [ideleˈzinizi]
Kgáweq’ kan [kan] → Doanu Lukpanic kam [kɑm]
Kgáweq’ ’únǝrǝk [ˈʔunəɾək] → Doanu Lukpanic uneleke [uˈneleke]

[Zaarin]

Doanu Lukpanic iel [ˈi.el] Brigantic ielos [ˈjelos]
Doanu Lukpanic idelesinisi [ideleˈzinizi] Brigantic idelesinis [ɪdɪˈlesɪnɪs]
Doanu Lukpanic kam [kɑm] Brigantic cam [ˈkam]
Doanu Lukpanic uneleke [uˈneleke] Brigantic uenelekes [wɪˈnelɪkɪs]

[Nortaneous]

Brigantic ielos [ˈjelos] Amqoli zhelu [ˈʒɛɫu]
Brigantic idelesinis [ɪdɪˈlesɪnɪs] Amqoli delyeshli [dɛˈlʲeʃlʲi]~[dɛˈjeʃji]
Brigantic cam [ˈkam] Amqoli kamu [ˈkamu]
Brigantic uenelekes [wɪˈnelɪkɪs] Amqoli berelyki [bɛˈrɛlʲki]~[bɛˈrɛjki]