The sound effects and music are nice. Also, the glowing effects are nicely done. Gotta love an in game tutorial. That's the way it should be done :)
I really had a hard time controlling this... even after getting the mouse sensitivity under control, I couldn't seem to go the direction I wanted to. I would frantically try to turn toward the black cube to shoot it and it would kill me before I could. That's when I could actually get up there. Most times I would jump right under the platform and into the lava, or make it up there only to run off the edge while trying to go a different direction entirely. I finally killed him and was carefully trying to turn slowly to try to make the jump over to the other side beside the spikes and all of a sudden the screen glowed over and over and I died again. not even sure what killed me that time. I tried to play this about 50 times. I just can't I am sorry.
If I could move around and play longer, I am sure the game would be great. Good job making a game in such a short amount of time!