Cool mechanic, but it's not necessary enough: every time I tried to use it, I died / almost died, sometimes before even establishing the link, and when I decided to give up and just shoot everything I made it to wave 23 at full health before getting bored and dying ^^
It would be nice to add something that makes linking required, maybe an ammo counter that makes your pew-pew gun useless after some rounds, idk. Also, do the bullets go through walls or not? Visually it seems they do, but they don't appear to hit enemies