Ok so now that I managed to run it (using the renaming fix), I'll give it a rating.
Actually it ended up being kind of fun. I enjoyed the use of different abilities for the three sizes. Obviously it's a little unpolished. The art style was nice enough, it could just use a few animations for the character and interactable objects. The dash and double jump mechanics and controls feel pretty good. It might just need some clearer instructions about the mechanics.