Good job! It was something new, I liked the idea and I enjoyed. I am not sure how much is fitting the theme of the jam though.
It is not convincing me the idea of having to press both Spacebar and Enter at the same time for bouncing on top of the enemies. This is something you could maybe polish (only pressing space, automatic bouncing...not sure). Also you could do some hp bar for the player and that it is possible to do some little jumps on the land (like the fishes do).
Thanks for the feedback! Pressing enter while on top of the enemy is mainly an optional mechanic (you can just press space while on top of enemies). By pressing enter, you can have higher jumps which can get you more points. The thing that makes it fit the "out of control" theme, is the fact that the player is constantly moving forward and has no control of horizontal movement. So the player can only jump over or on enemies to win. But I do think that I could tweak things and the automatic jumping idea you had is interesting.
