Our game, Filament, is at 9 ratings.
One path through the level: crazy curved ones. I think the controls are solid and fun, and you have different max speeds forward/back so you get a different challenge going out than coming back. I'm sure some levels are too hard but you can scroll through with PageUp/PageDown or the gamepad bumpers, and I think we included a good variety of experimenting with different mechanics.
It's definitely not as cool of a take on the 1D vs. 2D idea as Tunnel View though. :)
Edit: There's also https://itch.io/jam/gmtk-2019/unrated which shows the games with the fewest ratings: there are currently a whole bunch of games with only two or three.
--Josh