Thanks for the support, it's my first attempt on the level editor. IT wasn't necessary to me to see the checkpoints in the tunnel. I take good advice about decoration. The whole universe seemed pretty decent to me, but I guess you're talking about closer objects along the track to feel the speed.
Thanks for all the tips, and the HUGE skip that's on the top of the leaderboard :)
Enjoy!

If you haven't already, might be worth joining the discord channel. There's a dedicated editor channel where you can ask for tips and advice for the editor, as well as getting people to playtest maps before submitting them. There's a link to the channel on the main menu of Distance, top right corner.

From a design perspective; it's not clear where your checkpoints are in the tunnels, and you've got too many long straights with nothing happening which isn't really engaging to play. Spaghetti tracks (tracks that loop around on themselves) are conceptually nice, but in practice very easy to 'break' and take extreme shortcuts in - see my ghost replay for an example.

The lack of any decoration hurts as well; a lot of Distance's feeling of speed comes from speeding past the environment, but if there's no environment to speak of you lose that. It also makes it harder to hold on to players if there's nothing visually exciting.