thank you for the helpful advice :)

A few critiques.

Right path: there are many jumps in quick succession. It's unclear what you want the player to do. There is also an upside-down checkpoint, these are generally not recommended.

Left path: Your tunnel entrance is backwards, creating a strange gap. There are multiple checkpoints that spawn the player on the underside of the track

There are also broken checkpoints in other places throughout the track. You should check each one and make sure they work properly.