Inverse Link

You play as two ships linked together. Whatever happens to one, the opposite happens to the other. If one takes damage, the other is healed. If one shoots, the other raises shields. 

It can be a little like riding a bike with the steering direction constantly swapping, but you can get used to it.

Controls:

Left mouse: Shoot/Shield
Right Mouse: Shield/Shoot
W: Up/Down
S: Down/Up
A: Left/Right
D:Right/Left

Tip: Friendly fire is enabled, you can use this to your advantage