A nice simple rhythm game, fairly simple but an effective time-waster.
Personally I'd prefer if the icons were also shaped to resemble arrows in addition to displaying the letter. Overall its easier for me to associate WASD with directions rather than letters. Ultimately I kept getting confused with which letter corresponded with which direction but that's just a me thing, thought I'd bring it up any way.
Its also nice touch that killing a skeleton restores 1 hp in case you made a mistake or two on the way. Makes the game less punishing.