Sometimes when you hit an enemy you still take damage even when you land the hit, one main issue is if you attack in a jump even if you land the attack you still take damage, I don't entirely know how to explain it, but there is some slight issue with the edge and then jumping afterwards, but so far so good, I find it enjoyable, reminds me of old flash games
I only have one real suggestion, that being maybe a way to heal, just a little bit, while the player is able to reach the max size in the current way it is, due to some of the aspects of the game as it is in terms of how the enemies spawn with some hits being unavoidable, I would maybe add some way for the player to heal themself every now and then