Not terrible! Could use more fluid framerate and more depth to the gameplay, but other than that this isn't bad. I like the graphics.
out of 10...
gfx - 7 (good psuedo-3d)
sfx - N/A (I have no soundcard)
design - 5 (could use more accurate hit-detection)
gameplay - 4.5 (should have been smoother)
overall, this is a pretty basic idea executed decently, but without real PIZAZZ!