Sniper Barrel mutation

A mod for Nuclear Throne Together, that adds a new mutation which grants your projectiles additional damage based on how far they travel.

I guess the character grows a long barrel on their hand or something?
Anyway, this mutation provides bonus damage to your projectiles based on
how far they travel. No effect on lasers. Damage increase is roughly 1 damage
per 1.5 wall-lengths of distance traveled.