Sorry for the late response.
Few things left to sort out for this level:
Few faulty messages here, which I'm assuming are due to the level acting as a switch palace. Are the messages themselves (explaining the coaster and light game) actually in your ROM? If so, ignore these three images, as it should be fixed once I insert the level on my end.
Alright, I need to get this off my chest. I still hate how you switch between cars, since it's so easy to press left (or right) a bit too much and fall behind (or in front) of the cars. Is there a way you could fix the car jump to make it quicker and/or make the player less likely to fall off and through the track? It may just be me, but something seems really frustrating about being able to fall off simply by trying to normally switch carts.
That's the only issue I have with the coaster at this point. Other than that, it seems spot-on!
Oddly enough, the coin at the second gate (the "2" in "3231") didn't appear, rendering me unable to get this SMWC coin.
Touch these up and I'd say you're set.