Quite a simple game but a nice game nonetheless !
You made quite a few levels and I wasn't expecting so many ! I really liked the last one where you played with the physics of the jump.
If I have to make a few comments, the transition from one level to another is a bit quick in my opinion and I wasn't always sure that I indeed was in a new level, but this isn't much of an issue.
One thing though, if you ever make another game similar to this one, could you ensure the ennemies die when hiting the ground ? I had to look for one or two because they had fallen hahaha