I love the look and idea behind this map, but there are a few things I think would really improve the gameplay of the map. You should consider putting a platform to land on when you go off the edge of the roller coaster tracks so you don't take fall damage. That way you can kite zeds onto and off the platforms.
For example, these two areas:
https://www.youtube.com/watch?v=HsR6WN5v2pw
https://youtu.be/42W4uLDI_74

The map also really needs another staircase to lead to the midlevel. When zeds spawn at the top, they only come from one direction, which is down the one staircase that leads up. It makes it extremely difficult to get to the upper levels from the bottom level.

Also zeds path a bit wonky on this track:
https://youtu.be/ULpVe9_9r_4

And they struggle to path up to me up here:
https://youtu.be/UJ1cim6IQ2E