This game has an amazing concept. The levels are challenging, yet rewarding. It's fun to see the concept of not always being able to use the keys, since if you knock the letter away from one of the pre-determined squares you can't use that key to move anymore. It also got confusing at times trying to remember the seemingly random key-bindings at times, like S moves up or ctrl moves left... still, it made for a very fun challenge.
I haven't yet beaten the game, still stuck on lvl 13. But I think that's as far as I can go. But that's not on the game itself for being too challenging, it's simply on me for not fully understanding the controls. This is a brilliant game idea and I can only hope for more games like this in the future.