Couldn't get it to run on my Linux machine via WINE (black screen) so this is a review of the web build:
It was a fine experience until after the third checkpoint, after which the difficulty, and the distance to the next checkpoint, became unbearable. The spikes right in line with the jets was frustrating enough, but the power of the jets seems to oscillate, and there are some jets where the low point is too low to get onto the next ledge, so i end up sitting there waiting for the jet to get stronger to push me high enough. Really kills the flow.
Aside from that, the art is nice and the sound effects are fine. The music goes from moody and spooky to just grating after getting stuck at the same spot for several minutes :|