Health bars of hero monsters (which have two stars at each side) make it hard to count the number of hero monsters at late games because there are many big and small stars in a screen.
I suggest just make health bar of monsters to be distinguished by colors.
And it’s hard to differentiate hero monsters from normal monsters. Marks just blend into objects and monsters and can’t be distinguished easily espeically when there are lots of monsters. The star mark on hero monster need some fixes as I think (I think skull mark on bosses is much better than star mark)