I liked the concept of the game and the visuals look really good. I found that the controls need more polishing, it was hard to use the dash + jump in once you enter the tunnel. 

I think the main thing you should work on to improve in your next jam is your attitude towards your own submission. Instead of clarifying the mechanics and presenting your concept you spent your page description saying your game sucks. It's a game jam, most games suck! Your game was playable and looked reasonably good, treat your submission with respect and other people will treat it as well when giving you feedback to help you improve.

I don't think I can fairly rate this because I couldn't get past the first screen. I jumped on all the things. I pressed interact while standing next to all the things. I changed to all the different sizes on the things. Nothing happened. Either something broke or there's some mechanic that isn't being explained.

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.