Hello, I'm sorry to say I'd give this a -1 for a few reasons...
Firstly, the theme itself is a bit...questionable? What I mean is, the atomic bomb is a bit of a sensitive topic for some people, as it was a tragedy that struck Japan during WWII. This may be me being stodgy, but I think it's best to not make builds surrounding sensitive topics. People play games to have fun and I think it's best to keep things light hearted.
Secondly, there are an overwhelming amount of barriers in this map. It's okay to use barriers sometimes for a few jumps, but having full barrier neos and barriers placed to actually
fool people are no good. This is mostly because parkour is played in adventure mode (where barriers can't be seen) on the live parkour world compared to the mapmaker world. So it would be best to use glass or replace a block for barriers whenever possible, and use them mostly to block exploits.
Thirdly, the build itself despite the theme doesn't integrate the parkour well. What I mean by this is that there's a lot of floating jumps that make the build look a little messy and distract from the main structure.
The parkour is somewhat varied block wise, which is good but I think you could challenge yourself to incorporate more types of weird blocks! Many of the barriers do disguise that a lot of the parkour is floating, which could be better considering my second point. Try to attach more jumps visibly to the build and integrate them more. It might be easier to do this to by making the build a little more detailed texture wise, especially to the bomb itself.
Good luck on your submission! I am just a Mapper and community member, but I love to give others feedback to help improve people's building skills! I hope this can help you improve