the game looks very promising so far. it did however crash for me, but that is most likely because i use a AMD card and you stated there is a problem with that. Because of that i couldn't even finish the first slime quest, but i got the picture when losing to one so that was nice. Lol.
I also agree with a comment a bit lower down about being stunned by passing by other people as well as the lack of a tutorial. Like, i didnt know what the hook symbol was till i tried it which wasnt a problem. But what if it is a button that majorly messes up something? I would advice a onHover() function with a name, and maybe a 3 word description or something when hovering over a button.
Also personal request, not something that needs to be added. I would LOVE a close up picture or even animation of the characters, well, nether regions. especialy after they are well used.
the right mouse button to hide function in the character window isnt working but you can close it by using the scroll icon, so that isnt too bad. dont know if that function is missing or bugged.
Wish i could help more but i doubt my programming skills are good enough to help here. while i did work on some minor projects of my own, i still consider myself a novice. lol
Lastly, since i havent gotten so far i cant speak on the other things the other person mentioned but from what i understood, you need many more if() checks. Maybe mark the quests that you finished as finished but not yet returned. and then a if check to see if it is finished. If finished, dont change it, else, failed.
Anyway, i babble too much, sorry for the wall of text. I am VERY curious about this game and its development. Please, dont drop it. It looks very promising. (also yes please to running function.)