That's a cute little project. The art is cool, I like the "lobby" where you move from one level to the other.
Sadly, there are a lot of collision issues. The overall movement seems to also be a bit off to me. I also wish there was some outlines or animations on the items you have to collect because at the moment it's not clear or difficult to see in the background.
Here is a capture where I was stuck in the level.
It's not bad at all but it def needs to be tested/polished.