Liked the concept of some form of 'turn based' platformer where every jump and move costs some health. The ghosts (or jellyfish?) were very cute as well, I loved their simple but nice animation.
Sadly, the movement was a little too unintuitive and glitchy for me to get far in the game. You got stuck on terrain a lot and the build up of momentum with multiple button presses is a little too unpredictable. With many attempts I couldn't get past level two, kept getting stuck in the corridor... Maybe a more restrictive or controlled movement (e.g. press left and up to jump 2 squares to the left) could work better? That would make it more of a puzzle game... It depends on what your 'vision' for the final product would be.
Also, for a game where you can die really easily: A quick restart on the level you are on (rather than being booted to the main menu and having to play through things again) would improve things immensely. "Quality of life" features are hard to add during a game jam. But just getting one bit of polish (no matter how small) can really step a game up massively.