This was a pretty good game, but it did get annoying. I didn't know how to get any money to buy anything. It was basically just a boss game. I wish it had some regular enemies. I don't mean during the boss fights. I was able to understand it, I guess.
Hiding behind things was quite useful. It's a pity those were destructible after the first boss. It was certainly well paced. Not quite great, but still good. It was pretty interesting.