Simple easy fun, enjoyed. If I could only have one extra thing, would be when the potential upgrades popup in the center to wait a sec before registering clicks. If my ship is in the center and I'm clicking away > once the upgrades popup > it registers where ever my mouse is at the time so I'm not sure what I'm picking. I didn't notice there was a menu until I was just shooting at the bottom of the screen when it popped up. Feedback aside, fun and easy to pick up!