I like the maze generation, it reminds me of that old 3d maze screensaver.
The maze feels a little empty in relation to the keys, coins and traps. The content is spread out, and the clunky movement makes things feel even further away.
The "remaining keys" number for the trapdoor/exit doesn't actually tell you how many keys you need. The number actually goes up when you gather a key.
I like the mini-map that shows you previously covered areas, this is helpful.