Ok so first off, I didn't know that I had to jump from a building to the ramps because I didn't notice I had the double jump. I feel you should explain a bit the mechanics at the start of the game while playing (e.g. putting a lil popup text explaining that after you collected the first package).
The level design is kinda boring: all of the building are the same, you're doing the same parkour over and over to collect and deliver everything.
I don't feel the player controls to be a problem here.