Nanozoa is a GM production that features decent backgrounds rendered in black and white. Both keyboard and mouse are used to control the ship inside the doctor's body.

Use the arrow keys to move your craft around and left click to shoot. Weapon upgrades are awarded automatically, though you need to select it from the User Interface Menu in order to have the gun equipped for your next mission. Looks complicated but it's deceptively simple, plus only five short levels have been included with a final boss encounter waiting near the end.

Name: Nanozoa
Developer: LowFuel
Category: Shooter
Type: Freeware
Size: 10MB