I think the best in this case would be to contact the developer of Gylt to make them aware of the issue and to give them a chance to fix it. Especially when this is the only game you have problems with on Stadia. Sorry to hear though!
Played a few hours of the game with no issues.
I have been playing GYLT for a week now and have not encountered what you mentioned. Can you describe the conditions under which you play?
I think I found the issue, it's because I am using bluetooth headphones, playing with wired or the TV/PC speakers don't cause any issues, it's weird because it's the only game that creates this issue for me.
Anyway, I finished the game... mechanics are quite simple but story is quite good - sometimes depressing though. Good game overall.