Hit box for your character is terrible, monster attack animations are way off, inability to heal during the wave (unless you have regenerating armor, but still), cost of healing makes it almost impossible to upgrade bow (thankfully bows were drops), should have a key press to cycle arrows (q for one way, e for another) as clicking the arrow box in the corner when you have several monster attacking you is rather annoying.
All in all, was a decent game, but there are several minor issues that prevented this game from being as much fun as it could be. It was not that challenging as I beat it without dying.
3/5.