I don't know if this was a bug, but there were only four small enemies that attacked me at the very start. For most of the game I went from cell to cell without challenge, until the final boss where I went to max size and killed him almost instantly. There's definitely some good stuff about this game like the intro cutscene and the idea of growing for more damage vs shrinking for more mobility, which is a cool take on the theme. I just wish the balancing was a bit better.