Really well done! Very weird, but very fun mechanics :P How did you make that sticky slime? It really worked very well. The levels were also interesting. Definitely during the last few I had to think for a second how I should solve it.
Maybe as a tiny bit of feedback, it was not immediately clear to me how I could win a level. I would just shoot around and win eventually. After some levels I finally understood that I should keep the items of the red platforms. But this is really minor, and I think you could not have done it much better in three hours :P
Great job and super impressive for only three hours! I enjoyed it a lot :D