I'm not sure if you just had issues with the WebGL build or what, but some audio would have been nice (even if it was just a looping "ambience" sound).
The mechanic is simple, but still reasonably engaging, and it makes me feel nostalgic for similar types of games found in arcades.
The art looks quite nice. The skeletons don't have much in the way of an animation, but regardless, I'm a sucker for the 2D on 3D Doom-esque experience.
Cool game.