Hello.
Before I get started with my personal review, I would like to say that I am only a player of the community, and my opinion doesn't go into account for whether it gets accepted or not. I also don't want to hurt your feelings in any way, I am just giving feedback for you to use in the future.
Here goes.
First of all, the theme is great, as I don't think it has been done before, and I cannot find any map on the theme. Good Job!
Second of all, the build. The build is quite nice and suits its theme very well, and on the inside, it looks like the blocks in the wall are actually real blocks, but it's just a 3d illusion. Pretty Cool!
Lastly, The parkour. The parkour, in my opinion, is quite boring, as it is only block jumps and ladders. You can add things like single water sources, enchantment tables, flower pots, vines, chests, anvils, pistons and a few more. I counted 38 Jumps and 2 Checkpoints. Pretty nice amount for an easy map. Also, there were way too many air jumps. For example, there were quite a few going from the start to the dice, and from the dice to the finish. What I mean by air jump is that there are jumps not connected to a main build. I recommend you should've made the dice a bit bigger and put the entirety of the jumps on that.
Thanks,
SwagifiedGorilla.
Feel free to ask me any questions on the forums or if I'm online.