This is really fun. I played through it several times just so I could beat it. :)
There are a couple things I can think of that would make it much more enjoyable to play. The first is when I was doing really well I got ahead of the camera and I had to wait for the water to catch up. This felt a little obnoxious but I can see why you made it this why. Maybe you could speed the water up if the player gets to far?
The second is a quick restart button for when the player is stuck behind a rock or path and has no way of escape. Right now there is no option (that I could find) to do this. It would be nice for the game to detect this automatically but it would be appreciated if there was a button as well.
The art is very nice to look at and is very cute. albeit terrifying, if that makes sense. I'm not sure if you can do this in pico-8, but if you could make the menus a little easier to read that would be very appreciated.
The music is definitely a bop. 11/10 I would love to hear what a lava level would sound like. ',:)
Thanks for uploading a Linux version!
Could I review this game on my YT channel?