The game's structure is very basic but sets the pace for the game quite well. Enemies come at you in waves, each one containing a set of ships that must be defeated in order to move on. Once you dispatch them you'll battle the boss, a large vessel with several layers of shielding. Afterwards you move onto more sets of enemies, but this time they're stronger, faster and more difficult to defeat.
To control your ship use the arrow keys (or WASD) to move and the mouse to aim and fire your weapon. It takes some time to get accustomed to the dual control style, but once you do it becomes second nature. A more powerful charge shot is available if you hold the left mouse button for a few seconds. Unleash it and continue to fire your weapon for a series of power shots that will destroy almost anything in their path. It's especially useful (and dramatic) during boss battles.
Pixel Blaster has a lot of little extras that make the game extraordinarily entertaining. For starters, an online high score board keeps track of the top 100 players in each difficulty level, giving you a shot at the limelight. Physics also play a subtle but important role in the game, causing your ship to drift every time you move and forcing you to adjust for shifting weapons fire. My personal favorite feature is the shaking screen whenever something explodes. It makes the game feel a bit more intense.
Pixel Blaster is a simple shooter that's a winner for its clean style, superb implementation and well-paced gameplay. It's a tough game to stop playing once you start, so consider yourself warned.