The sound is peaking at times. Running a normalize pass on the audio would have helped with that. My ears shouldn't ring after opening a gate. Ouch. Neat concept of using mind control for the skeletons. I did find the controls to be a little iffy. Like you can walk left and right and transition to up and down but if you're already moving up/down you can't then move left/right. You have to stop/let go of the controls. You can get around that restriction by not branching your controls with if/else statements. Instead handle each movement case independently of the others. Or, code in diagonal conditions like
if(key[w] && key[d])
{
move diagonally...
}
The level transitions are nice and crisp though you can't go back to the previous level from what I saw. Not sure if that was intentional or not.