I thought this was a very entertaining, simple game! I was confused at the start, but generally figured out the rules quickly enough. Each entity had a nice, distinct rule to them and the beastiary was a cool addition!
Speaking of the beastiary, I think there’s a bug unlocking the white entity (was it called Bill?) I was caught by that guy a couple times before it’s mechanic clicked with me, but the beastiary entry never unlocked.
Another small mechanically thing that irked me a little was the plant entity. Mechanically it does what it says on the tin, but I felt that this entity should, maybe, give the player a very moments (half a second maybe?) after the bubbles appear in order to react. There were a couple times where I was just shy of clearing the plant, then I was dead the moment the bubbles started. Just a little (very tiny) grace period between the bubbles starting and them killing the player would reduce the frustration with it.
Over all, I really liked this game! Very well done! If you’re interested, I played this game on my stream the other day.