This is such a fun concept! And I really like the character design (just being a pair of pants is hilarious).
The only issues I had with it were that the shrink/grow mechanic felt a bit too sensitive, and the music only seemed to play on the left side of my headphones (for that one, just disable panning in the audiostreamplayer2D, or change the node to an audiostreamplayer).
Overall, really original game.