That was INTENSE. The art vibe was pretty awesome considering it looked like you did it in paint. I liked it. Good sound effects. Loved the height of the jump. The power changes in the levels was a neat mechanic.
It would have been nice if the tutorial was in-game. It also felt unclear whether the slam was actually doing damage. It definitely felt overwhelming. The difficulty level could have been tuned down, or an option to tune it as a player would be nice.
Nice game!