The parkour is perfectly suitable for a medium; good length, difficulty, variability, and it's overall pretty fun. I would suggest adding a sign at the top of Phineas' shirt though, there's a rather long stretch with no clear direction to go and you can't see the next jump from directly after the previous one (cross neo).
The build is accurate, but it's pretty flat, and I think it would look a lot better if you added a bit more depth. It has a fairly nice color palette, as well.
The theme is original, no other Phineas and Ferb maps, surprisingly.
+1, good luck!
Keep in mind, I am not an official map judge; take my review as that of a normal member of the community <3