thanks for playing! I haven't got many tips for you on audio aha my team member produced the audio for letters be chaos. But honestly the art style for your game fits so well with like Don't Starve and .. that game with oxygen in the title ahaha i can't remember it. I think you could just look at what other games do with their audio (with a similar style of art) and consider that.
Let me be clear, the audio in your game is not bad at all, it's great, it's just the weakest part OF your game. Being the weakest certainly doesn't make it bad or even less than good.