you cant make them flash, but you could have like a wall on the ground, and interlock powerups so you cant pic them up, etc, and you could also have teleporters (receivers only) they have to be on, so you could see the light, but blocked, but you cant block them with something that blocks the lights!
Put some objects very closely at each other and make sure theyre even, as a floor. also make sure you post it in Casual or in Aesthetics.