Cute little marble simulation game. Reminds me of Marbles on Stream. It's indeed a fun way to decide on things, especially when you can import your own textures.
I can think of several ways or ideas for this game, such as having a custom preset to load in marbles, or different maps, or even a way to have the camera follow a specific marble.
I guess I can see how this relates to the theme, but I think it's not a strong relation. A way to improve it is maybe to add more things that interact with the marble. Maybe part of the map only allows the first 10 marbles to pass, then the route is closed. Or maybe some parts require to sacrifice a marble. I don't know, there's a lot of things that can be done xD.
I think the textures of the 3D objects are pretty neat. Reminds me of old school games like DOOM. Though the UI could use a little bit more work, especially for the list of marbles. It could be resized down a little bit.
No audio. Some calm music would maybe help. Also some SFX such as starting the race, finishing the race, or maybe even when each marble hit each other would be fantastic (tho I'm not sure on the marbles one, may be too obnoxious).
Overall, I like this game. I can see the potential with this game, especially with the import texture part.