Loved the game! specially the art, color palette and mechanics! Also it's rare to have a game with good audio, so that's something that I have to compliment too! But unfortunately I had some problems with late input on controls and two specific bugs on the second puzzle when you have to use both size abilities in the mushroom area that made me get stuck during my playthroughs.
1. After being launched by a mushroom pad it seems like the character gets a little stuck on air, so most of the times landing would be on the edge of the poisonous area, making me always lose a heart;
2. In the times that I could land well in the green floor, without touching any purple poisonous areas, I would still lose two hearts, tested it sometimes and it seems that it happens after getting the "get tiny" ability, don't know if that's intended since I got tiny, so maybe my life shortens, but it continued to be only one heart even after retrieving the ability.
I reloaded the page and tried playing again your game, sadly those events still happened.
But hey, from all of the games that I played in this jam, I think yours was the most creative, smart and polished! Even if I got stuck it was an incredible game and experience, the puzzles were trully unique and challenging, creating interesting and fun puzzles for a game is already an achievement by itself, it can fry oneself's brain, me, I'm that oneself, love thinking on puzzles, it's hard to make something that's fun and engaging! Your game made me inspired to try doing something like your project someday and I will recommend playing it to my development partners, I'm sure they will have fun and appreciate it too!