Furry 2

From the manual: Furry 2 is a DOS-styled platformer streamlined to require no real dialogue or instruction. Go through countless different hazards and enemies to reach the end of the level and occasionally large boss enemies. You can collect many different kinds of weapons to help you, often found in hidden spots strewn throughout the stages.

Controls:
 * Shfit: jump
 * Ctrl: shoot
 * left, right: move
 * Down: Duck
 * Shift + Down: Jump down

Collect 50 gems for an extra life.