Really fun little game! Love the simple visuals (wish the spikes weren't so sad :( ), a cute little platformer. If you wanted to flesh it out it could be fun to have the different atoms grant some benefit or something when picked up, to extend the risk-reward system of getting bigger and make some different kinds of platforming challenges, but that's not to say you should have done this for just this short jam game! I really liked it as is, nice job!