Idk my personal bias is against top-down in marble games. but maybe it's a fit for your game. I say try both and go with your gut. Check out the game we just made in my profile. We're still working on it.
I went with both, and yeah I'll check out your game! I also added that shader thing so I'll comment another reply once the judging is over so you can see the improvements. I think it actually made the game WAY better.
