I agree with all the suggestions here, but especially concerning bloom and coyote time.
The bloom looked cool at first, but it ended up causing some unnecessary eye strain after a couple restarts.
I was thinking about coyote time as well. As designers, coyote time would make it easier to sync the levels with the music, since you would know exactly where the player will be at any given time. Though, this would probably require making a beatmap, which I know is hard (I'm having to do it for my current co-op, bleh).