Thanks for trying it out, and I really appreciate the feedback!
The fact that mouse won't capture when embedded in a browser doesn't help with the controls either. Something I overlooked when deciding to go with the web route, but I just wanted it to be quick and easy for players to start up.
I agree with you 100% on the power-ups, and that the levels need more variety via mesh materials and skyboxes. I wish I could make the actual meshes for the levels more varied, but whenever I create a tri-mesh collision sibling for anything imported from Blender, the collisions would include invisible bumps that would send the player flying off even though the surface was completely flat.
Thanks again for checking it out and letting me know what you think! Getting feedback helps tremendously with both subjective issues and staying motivated!