Really fun!
Loved it! Using this handicap you could have very easily done something like One-Button RPG or just a mouse-click game, but you went somewhere TOTALLY different and it was awesome.
My only complaint - due to the difficulty of the enemies, I spent WAY too much time overlevelling. The final boss was a breeze due to this. Perhaps a balance issue?
Also, I agree with the previous poster, the Game Over screen was rather disturbing, but I kinda liked it for that reason. lol.