Congrats on finishing a game! I like that you can change your size but it currently feels pointless to do so. If you'll make a post jam version you could try creating situations were the player has to grow/shrink or at least benefits from doing it. Having a strict time limit is stressfull and does make you feel like you're escaping an explosion which is good. However with these type of games a "Start" and "Try Again" button is certainly important to have.