Invader is an excellent vertical scrolling shoot-em-up for the Game Boy Advance. There are 8 levels to shoot through each ending with a end-boss. The player can select from 2 different ships each with specific features. Enemies leave coins that can be spent in the Shop, where upgrades such as weapons, extra lives, and credits are available for purchase.
Game modes include Arcade, Survival, Boss Attack and 2 player Cooperative via the Link cable.