From the author's press release:
Droid Assault is the latest in a series of modern-retro arcade shooter games by Puppygames. The game captures the raw feel of 8-bit games such as Paradroid and Quazatron with modern graphics and sound. It's available for Mac OS, Windows and Linux.
Droid Assault harkens back to 1985 for its gameplay and style, with Puppygames’ signature stylized retro graphics and atmospheric sound effects. Players control a droid infiltrating the Omni-Corp warehouses, in which all of the battle droids have accidentally been switched on and are running amok. Destroying droids earns transfer points, which in turn enable the player to capture more droids using a transfer beam or capture fixed gun turrets and turn them to his or her own advantage.
Eventually the player builds up a small army to assist in clearing out the factory warehouses. The captured droids run off and start destroying enemies by themselves. Along the way, droids can be modified with a whole plethora of upgrades and powerups.