Hey Great first mod
I cannot comment on gameplay side of things as I am a rookie at parkour I will still attempt it however when I get the time to do so.
Ok, So first of all I really appreciate What you tried to do with the patches of grass,
The problem is It is all angled making it very hard for beginners to run on.
Maybe next time use one grass block that is flat (0 rotation) or very slightly angled and build rocks or slabs around the top to create the same kind of grass shape, but still giving one even flat surface and path to run on.
Lava is fine for me I could tell it was lava,
But the sides for me ruined the whole effect, They look extremely straight and flat and un-natural and lacking the detail you gave the the rest of the map.
5 / 10 for me, great first attempt. Try to give your whole map the same level of attention next time,
Remember A wall doesn't have to be just a flat surface, Also the player chooses to interact with a wall, They don't have a choice about the floor.