This is a really polished game with some addicting and fun gameplay! The SFX is on point and the movement feels really smooth. I really like the ghost mechanic too - having a rewind system where you have to save yourself is a lot more strategic than just having a generic three lives system most shooters have. I think the only thing I'd change is moving the cooldown timer somewhere where it's easier to see, such as above the player, instead of having it on the side.