The overall execution of the game great, very polished and well presented. I especially liked the pixelart backgrounds.
The time loop mechanics are really clever and obviously have a lot of depth, but I found it so overwhelming and even after trying the first couple of levels again I still can't really work it out. I persisted with it but I think a lot of people are just going to bounce off the initial difficulty spike. There's a lot of things to keep track of and even the first level had me hopelessly stuck and just jumping around wildly waiting to luck out. I only managed to get to the fourth screen after about fifteen minutes.
I think maybe if the various mechanics like the countdown, respawning with the E key etc. were introduced more slowly over the first few levels it would make learning what's going on easier. I don't want this to sound too negative, there's obviously some really good gameplay here, I just couldn't get to it. :)
I'm guessing it's just a mistake that the audio is really quiet. I turned up the speakers and the music was actually really nice :)