GlueFO 2.0, from the irRegular creators of Sproing Reloaded, has a simple premise: what if the heroic ship in Asteroids couldn't afford ammunition? What if the global recession were in fact galactic, and the only way you could afford to bust space rocks was by gluing drifting pebbles to your hull, and then spraying them at the asteroids like deadly gravel?
That's basically the whole game—fly your sticky self into the teeniest asteroids, and fire them at the bigger ones. Use your bonus points between levels to buy power-ups like the tremendously useful Orb Vacuum and the surprisingly pointless Rotational Thrusters. Move your ship and fire with the mouse, activate your upgrades and expendable weapons with the keyboard.
Improvements on the first GlueFO include lots of new power-ups, a creative set of challenge stages, and not one but count 'em two survival modes. My favorite gameplay addition is the evil GlueFOs, who will chase after your own ammunition and rocket it at you with pants-wetting accuracy.
Due to the generous (but non-refillable, mind) life bar, this isn't a horribly difficult game. However, if you're the sort of player who likes a stronger sense of achievement, then you are still in luck. Guess what else you get in GlueFO 2.0. Go on, guess! Achievements! You get achievements! Yaaaaay! Everybody gets achievements!