I tried again and I did get it to load. What I saw looked like I was in an Endless Fall... but I never died. Almost like I clipped through right from the start. Definitely works with a keyboard, thanks for helping me out here.
And of course I forgot to talk about the actual game: I like the idea and the brutality of sometimes getting killed during respawn by some hovering-in-the-air spikes. But like others, I had a lot of camera issues. I couldn't see where I was going most of the time. I wanted a "move the camera up slightly" option to help with that. But the concept is a great take on a Marble Madness-like game. Very well done!