I really liked this in concept, but I think starting the players on the highest difficulty level and forcing them to shift down may be a bit demoralizing. Also, the idea that the level goes up when you die seems counterintuitive, because your automatic response is to then just shift down a couple times.
The art and the music is great. It feels like Blade Runner meets Short Circuit meets Tron. The mechanics in general are pretty solid. The biggest issue I had was the fall speed. You feel like a sack of lead potatoes. This is especially pronounced when you hit the floor portal and immediately zoom from the ceiling all the way back through the floor portal.
Also, I hit escape to pause it and couldn't figure out how to resume again? I ended up hitting restart, which erased my progress, so I ended up not beating the game.
In the end, it was a super cool game that feels like it could use a few small tweaks to make it excellent.