First of all I love the 3D retro grafic! Controls felt nice, mouse sensitivity might be a bit to high, though. I liked the "jump-bar".
Regarding the sound: I did not like the intro music but the sound effects were nice. I would think that some atmospheric music would improve the feeling of the game a lot! Sounds used for player feedback are very nice, though.
I would have loved to have a tutorial and a bit of story. Maybe thats something you could add later.
Gratz on your submission!