Short, simple, sweet. The upgrades always came at decent time and were almost always helpful. I say almost because there was the one movement upgrade with pressing 'E' that I could never get to work, but holding down the arrow keys isn't difficult, so it never felt like I was truly missing anything. You also sparingly had nothing to do, so the game never lost its pace for long. However, the beginning was a tad bit oppressive given that you could hardly see, but you get over the hurdle quick enough to where it isn't that painful. The ending also drags a bit, but other than those two minute issues, I had an overall pretty fun experience.