This game is really cool ! The controls feel pretty responsive, the bubble drifts just enough to feel like youre underwater, so the drift is not frustrating at all. I really like the UI for the bubble count over the spider, it looks cool. The concept is really good too, making you rush though tight passages, and the slippery controls make it even better. Its really cool, and i think you should push that concept further :D
If you really wanted to improve something though, and im being nitpicky, I guess you could add camera constraints so that the camera never lets you see the level border walls, that are only 1 block thick