That was really fun! Loved how everything was reversed, even the idea of cats in trees. Great job at integrating that as a mechanic!
I kinda disliked how, on one of the first levels I had to use a fire item that affected blocks outside of the screen, to use it as a one fire-block instead of 2. I also felt like the latter half of the game levels weren't as tightly designed as the first ones.
Big props for taking the time to include an editor tho! Love when devs handle the tools for players to do their own thing. Awesome stuff!