I'm happy to say the windows version ran fine, just wanted to note that since I saw there were problems with other operating systems.
This was pretty fun, I played all the game modes and found moving the balls to be fun, but some of the game modes were a bit confusing. Like the Race mode is obvious, and the Time Attack mode I think I understood where you have to pass the next checkpoint under a certain amount of time.
The Speed Trap mode I didn't understand the objective. Was the intent to maintain a speed under the speed listed at each checkpoint? If so then why is the leaderboard at the end based on highest max speed?
I'm honestly not sure if I won or lost lol.
Moving as the balls I think felt mostly good, I especially like how when you collide at a decent speed the UI shakes with the camera. Controlling in the air felt like I had some level of influence but not so much that I could turn on a dime without significant effort. Which I think is a decent balance for me personally. It was fun to bounce up in the air because I took a turn too quickly and then have to reel myself back in just in time to land back on the track.
The game for the most part felt a bit too easy for me, I had the AI set to hard and I was able to win the race twice with a seemingly good lead. Well actually the second time the AI bounced me off the track, and I ended up being able to get back on the track near the third or fourth checkpoint, way ahead of the AI. I couldn't figure out how to respawn, I tried pressing E but the control might have changed for the race mode without me noticing. Either way, I don't think it was the intended way to win but it was fun, can't deny the results.
In all the game modes I seemed to consistently land near the top of the leaderboards, and I don't really play racing games, so maybe its too easy. But if a bunch of other people say its too hard then maybe tone it down some way.
I didn't login or make an account (on principle I try to avoid signing up with actual info for jam games, nothing personal for this game), just played as guest so couldn't tell you how the online leaderboard worked in terms of saving my results. Though I was confused by the login screen at first because I couldn't see the very faint text fields prompting a username for guest login. So perhaps adding some sort of outline, underline or distinct background to the text fields would be helpful.
For other suggestions, I think the "speed trail" behind the ball is kinda neat as I found it to more easily display speed than the speedometer (since my eyes were focused on the ball and the track). But it seemed like the spawn for the trailer was either lagging or was too far from the ball mesh, because there would sometimes be a gap between the trail and ball.
Experimenting with more variation in the track like adding more jumps, or maybe forks in a track could be a good idea. Might play well, might not, but could be fun to try out if you have time/will.
Overall I like the concept, and it played fine for the most part, with more content (which I think you mentioned is already on the way) and a little more polish I can see this becoming much more enjoyable. Nice work!