Doesn't look like it would be very exciting to play, very tame. Try being more bold, flat and straight are generally adjectives you want to keep out of your parkour mods.
These exact obstacles have been used a million times before and they got old about 7 years ago.
Just playing around with the scale and rotation sliders can be a good way to discovery unique obstacles, otherwise I recommend watching parkour videos or moviescenes for inspiration.
I would also advise against using upwards stairs as an obstacle it tends to be a hassle and a chore to get through, at least for me personally. I usually try to limit vertical movement to leap or climbing obstacles, ie a rocky mountainside or jumping to reach a high rope. Ramps and stairs generally suck to play around.
Can't say much about it lookwise because it's obviously an incredibly early wip but try staying away from full greys. Unless it is part of a mods theme(for example a metal enviorment such as a factory, and even then you should incorporate other shades into the objects) greys are very boring to look at which for me makes the mod boring to play and the replays boring to look at.
My first mods were very similair to this one, a floating and straight track with red obstacles. People might have bought that 5 years ago but today players expect a bit more.
Visualize what you want to create before you start working. Give your mod a theme, instead of setting out just to make "a parkour map" set out to make a jungle parkour map, or a rooftop parkour map, makes things a lot more interesting to play and look at and also more fun to create
Very keen on seeing what you can create, keep working