As you mentioned, it is a fantasy track, the big rainbow, the fake puddles (every where) the huge purple trees, the huge bridge over nothing are a bit much for me, I would recommend to tone everything down.
The three lanes all around is also weird. If the goal is to be different then that worked.
some aspect of the scenery are looking good, like the alpines mountains, I get it is version 0.1, will be curious to see the subsequent versions.