I like that, short and simple but pretty fun, and the mechanics are pretty creative. Did you make the music yourself? If so it's pretty good too.
The level design is definitelly the best part of it, at least until you introduced the frog looking things. They shoot you from outside of the screen wich is pretty frustrating sometimes. The falling rocks could use a bit telegraph too, they just comes out of nowhere and takes you by surprise, but in this case it's nothing that a bit of memorization can't solve.
Also, I use Construct as well, and I noticed you didn't disable the platfrom behavior default controls, so I could control the character with the arrow keys, but since you didn't program him to be controlled by them, I used them to moonwalk my way throught the entire game lol