From the same competition that brought us fuzetsu comes Alpha Shot 4K by kappaOne. Press the space key to shoot and collect power-ups from enemies which you have destroyed to increase your ship's firepower. The primary weapon can be upgraded to level fifteen.

Simple but surprisingly fun, considering it's small download size. Requires Java 1.4 or better to run.

Name: Alpha Shot 4K
Developer: kappaOne
Category: Shooter
Type: Freeware
Size: 1MB