For a simple-looking space shooter...
a side-scrolling one, no less, perhaps the most overdone genre of game on NG... this is QUITE good. For one thing, the graphics are quite unique and work quite well, both in the intro and the game itself. Secondly, you've provided a great interface, both with the actual controls for the game and the on screen display... and finally, all the different powerups/upgrades/weapons and enemies... it's really slick and fun to delve into. I can't help seeing the first enemy ships you see as air-hockey-table paddles, though. Heh.
Fun, challenging, good graphics, good gameplay, love the way everything's been done... there's nothing better than firing lava-ish bolts at all the UFOs and watching them explode into green gas clouds. Way to go with this! Kudos to you!