Thanks so much for this! I don't get much feedback around here so it's very much appreciated. So glad you found the controls tight and responsive, I've been spending TONS of time getting this game feeling right on different devices and it's good to hear you enjoyed playing with just the mouse, you can also try WASD and mouse buttons, that's my personal favorite setup. I'll check out that waveswim cave and see if there's anything goin' wrong there and fix it up.
I plan on having a new build in the next couple weeks that will kinda give more form to the game, and i'll also make sure to create a clear "end" to the demo so people don't go wondering if they've completed it or not, even if its very close to the start.
Oh and as for the audio crash bug I THINK it's resolved but didn't do much testing.
Thanks again for playing and leaving some feedback!