It has very bare bones graphics, but they're kind of stylish in a way and suit the simple nature of the game and also the fact that the levels are generated. It's not too simple, however. You can get power-ups and you can't just shoot all the time because of the cooldown. The enemies aren't the smartest you'll see, but give a tough challenge.
I'd like to invite your game to take take part in our Game Development World Championship, especially the jam entries category!