I don't understand many of these complaints...
The graphics were great - simplistic, but still fantastic. It may be the simple fact that it's 3D, but the simplicity of it all works well for it.
The gameplay was also simplistic but great (a sense a minimalistic approach to game design going on here...), though one gripe I had was the camera. It took way to long to return to it's set point behind the player after things like teleporting, and I was left to just wait for it to return to it before carrying on, which kind of breaks the immersion you have. Perhaps add camera movement into the next game (nothing too complex, perhaps 90 degree turns with a button).
I can't comment on the sound (my speakers) are broken.
8/10, 4/5