I'm afraid this game is very flawed but eh artwork on the cards is nice. Boring at best, there's no incentive to kill enemies. The skeletons give you 1 coin and the green guys can't be killed (at least at level 3).
The viewpoint is hampered by lack of definition, so when coins/enemies/spikes overlap, it's hard to precision platform.
What are all the cards I pick up that aren't "New Cards"?
How am I supposed to avoid the spike in the playing field?
Controls? With a gamepad, I could only shoot with Left Mouseclick and nothing else. Eventually, I managed to move with WASD.