[Arkhaic]

shadPS4 has a logs folder you can get the errors from.
If you're using the Qt GUI version, open shadPS4, right click on your game, and choose Open Folder -> Open Log Folder.
If you're using a command line version of shadPS4, then you need to manually navigate to the shadPS4 log folder (should be something like C:/Users/username/AppData/Roaming/shadPS4/log on Windows).
In there, there should be either a shad_log.txt or a CUSA00062.log file containing all the errors (depending on your shadPS4 settings).

Thanks, I managed to find the log file, I'll attach it in this reply. This is the result of an execution that didn't make it past the black screen.

-I tried to run it a few other times to gather some text samples to paste here. So from a first look I can say that this line is the first error that occurs:
[Lib.VideoOut] <Error> driver.cpp:224 SubmitFlip: Flip queue is full

- From here, it starts spitting new ones:
[Debug] <Critical> video_out.cpp:347 operator(): Assertion Failed!
EOP flip submission failed
[Lib.Net] <Error> net.cpp:1008 sceNetInit: (DUMMY) called
[Lib.Net] <Error> net.cpp:1088 sceNetPoolCreate: (DUMMY) name = DataCapture size = 16384 flags = 0
[Lib.Ssl] <Error> ssl.cpp:697 sceSslInit: (DUMMY) called poolSize = 311296
[Lib.Http] <Error> http.cpp:264 sceHttpInit: (DUMMY) called libnetMemId = 0 libsslCtxId = 2 poolSize = 49152
[Lib.Http] <Error> http.cpp:118 sceHttpCreateTemplate: (STUBBED) called
[Lib.Http] <Error> http.cpp:516 sceHttpsSetSslCallback: (STUBBED) called
[Lib.Http] <Error> http.cpp:88 sceHttpCreateConnectionWithURL: (STUBBED) called
[Lib.Http] <Error> http.cpp:108 sceHttpCreateRequestWithURL: (STUBBED) called
[Lib.Http] <Error> http.cpp:38 sceHttpAddRequestHeader: (STUBBED) called
[Lib.Http] <Error> http.cpp:38 sceHttpAddRequestHeader: (STUBBED) called
[Lib.Http] <Error> http.cpp:38 sceHttpAddRequestHeader: (STUBBED) called
[Lib.Http] <Error> http.cpp:321 sceHttpSendRequest: (STUBBED) called
[Lib.Http] <Error> http.cpp:258 sceHttpGetStatusCode: (STUBBED) called
[Lib.Http] <Error> http.cpp:188 sceHttpGetAllResponseHeaders: (STUBBED) called
[Lib.Http] <Error> http.cpp:173 sceHttpDeleteTemplate: (STUBBED) called
[Lib.Http] <Error> http.cpp:531 sceHttpTerm: (STUBBED) called
[Lib.Ssl] <Error> ssl.cpp:749 sceSslTerm: (STUBBED) called
[Lib.Net] <Error> net.cpp:1093 sceNetPoolDestroy: (STUBBED) called
[Lib.Net] <Error> net.cpp:1774 sceNetTerm: (STUBBED) called

- After this, the lines become yellow and are all similar to this one (which is the first one):
[Lib.AudioOut] <Warning> sdl_audio.cpp:64 Output: SDL audio queue backed up (65536 queued, 65536 threshold), clearing.
The two numbers in the brakets keep changing.

- In the end, there's a single tiny line:
[Lib.AudioOut] <

This is all I've got. Thanks!