It's kind of hard to grasp what's going on, I suppose by modifying the color scheme, shape and size of particles and elements, adding a health bar and some sound effects (shooting, jumping, etc.), it would be a pretty decent game. I suggest the WASD control 'bug' was a little bit too much, however I liked the hidden obstacles, it may also work with normal controls and hidden obstacles (maybe with additional ones, like one that switch the WASD control to SDWA, another to increase or decrease health, ammo, etc. - hidden or not). Hope my comment is constructive all in all.