GridWars is a free downloadable (for PC or Mac) old-school-style shooting game that's remarkably similar to Geometry Wars on the Xbox. Your small ship sits in a one-screen grid and vectorized enemies spawn to attack. Use your any-directional gun to stay alive while you rake in points.
Why are so many of the most difficult video games also the cutest? Maybe my brain just automatically forgets games that are both ugly and frustrating. Added to the "cute but evil" list comes Within a Deep Forest, a completely free downloadable game for Windows that casts you as a little blue ball, bouncing around a delightfully whimsical little world filled with the most frustrating jumping puzzles known to man.
Ray-Hound is a simple, well executed downloadable Windows shmup with a creative twist that sets it apart from other indie or commercial releases. Like Ohkubo's previous game, Warning Forever, Ray-Hound is a tiny download and absolutely free.
Frets on Fire is an open source clone of the ever-popular PlayStation 2 music/rhythm game, Guitar Hero. And just like Guitar Hero, Frets on Fire features a handful of songs and allows you to play the guitar sections by pressing just a few keys. Instead of using a separate controller to mimic the guitar, Frets on Fire lets you pick up the keyboard and jam in right front of your desk. Best of all, a built-in editor lets you tab any song, spawning a growing community of music-modders on the web.
Knytt is a downloadable game of exploration and atmosphere for Windows created by the author of Within a Deep Forest, Nifflas. The game emphasizes discovery and intrigue over everything and creates a massive world with varied environments and lots of places to explore. A spacecraft kidnapped the cat-like Knytt from his home but crashes on its way back, sending pieces of the ship across a mysterious planet. Your job is to traverse the barren world in search of the missing parts and try to get back home.