An excellent game.
Just finished after 5 hours, though you can continue by playing through the levels again another time -- continuing to upgrade your character.
It's a great way to increase your reaction speed. It's basically an upgrade to the classic games Breakout (Atarii 2600) and Arkanoid.
Your job is to kill the brick-shaped aliens by spending for a glowing "ionball" that slowly injures them until they die. The ball moves quickly, the explosions are a great distraction that makes it hard to follow the ball, and there are tons of upgrades to make the game exciting and give you different levels of replayability.
No crashes, but I found two minor bugs that required the restart of the level. But that has no effect on your game.
Graphics begin at 640x480 and go up.
Music is nice, but there's dubstep and I know some of you don't like that. Of course, you can turn down the volume so you don't hear it if you prefer.
The level design toward the end of the game is exceptional and I highly commend the level designer.
I don't like that you can die even after you finish off the last "alien brick", your lives max out at 10, and there are no level numbers (ragingly annoying).
But other than that, I find this to be a quality game.