sorry but i'm going to give you a -0.5 as my overall rating :c
Theme: unoriginal as said above, there's a checkers map and we have chess maps which could be considered as a similar theme. -1
Build: I don't normally say this about scattered builds but it looks decent, however next time you should only have one main build and not multiple. I know its kinda hard to do that with the "race" aspect, but in the future, just make one build and it'll make your map neater. 0
Parkour: it's very repetitive but it's a good length and difficulty, next time use blocks like ice, soul sand, walls, heads, etc. to make it more varied and more fun to play. -0.5
good luck c: