Just went to look at the Map. Here are my thoughts and views about it:
1) Far too short, I just went through it and it took I'd say less than 1 min 30 secs. (Without speedrunning) Easy Parkours don't necessarily have to be short, take Nature Parkour as an example, although it's long and has 0 checkpoints, it's one of my favourites to go through because it's fun and easy.
2) I appreciate the effort with the black wool at the bottom to separate the top and bottom half of the 'cave'. Although both halves of the cave system are barely detailed, with just 1 block as a palette for each. The occasional coal block is seen but doesn't really blend a lot with the brown walls, maybe brown wool instead would be better (adding in another brown-ish block wouldn't hurt, either)
Same thing with the bottom half, throw in more block variations that blend with the black.
3) Looks way too similar to Grass Parkour, except it's brown. All of the claustrophobic and 'cartoon' like atmosphere reminds me a lot of it. Maybe making larger rooms and of course the block variations I stated above would help with that.
4) Don't exactly understand why the final room is yellow, orange and red considering the rest of the parkour is brown and black. Seems very random to me.
5) The walls through the cave system are extremely flat (same with the ceiling) some more terraforming for that would be nicer (if it was made bigger you'd have more space to do so)
Hope all of this helps, good luck with the Map. <3