I couldn't seem to purchase the powerup items. And then when I would try the round would start without me getting a chance to pick my increases in ability. The font was also a little difficult to read even in fullsreen. Part of that purchasing the the power up item was that I was pressing E, but maybe it actually says B? etc. I like the concept of the game - it could go on for a while as you up the ability of the character. And the diversity of enemies is great.