For an idle game, it's not so bad.
I do have a concern about the health bar: whenever it's upgraded, you don't get a health point.
5/5 health, upgrade, suddenly it's 5/6. And no game over at 0. So really it should be health increases, 5/5 upgraded to 6/6 and game over when health reaches 0. Otherwise, no point in having the health bar.