I think the game would be more engaging if the player didn't have 5x times the health of the enemies. It gets a little stale fighting multiple easy fights in a row. I think every fight should be separate and more difficult.
Yes the balance is all over the place, at some point I had planned for the enemies to keep scaling the longer you got (with weaker ones becoming stronger versions of themselves) but I was running out of time to polish it and had to remove it