This is a very cool idea! It's quite difficult at the moment but you can definitely see the potential here. The music and the minimalistic style works well together and I like how the differen "charactes" handle a bit differently. :)
However I could not initially figure out how to progress since no where that I saw was it mentioned that you could press shift to respawn. So for any future players the "cooldown" in the topright corner is for the "respawn" mechanic that you trigger by pressing LEFT SHIFT :P
One suggestions if you choose to keep working a bit on the concept.