Navigating the cube was very interesting and I managed to make it to the end after nearly losing half of the alphabet :D even with the trail you leave I found navigating the maze quite difficult but still enjoyable. I think the wallwalking and the puzzles were excellent. Getting on the floating middle was the most difficult puzzle for me to figure out, it took me a while to learn that the floor tiles that trigger a moving block were slightly different from the others.
I liked the word puzzles, which got progressively harder as you lost more letters. And I really like how you did the rolling credits because of that :D it was a very nice touch.
Very cool concept, great job!