Hey there mate,
I hopped on Parkour and gave your little map a try, it certainly seems like a unique build from my perspective as I haven't seen any maps like this, might just be my lack of knowledge. Some jumps were certainly a little infuriating and some I couldn't complete as I had to open/close a door to do the jump, etc. Honestly, this build/parkour submission has great potential but I feel that 50 jumps aren't necessarily enough for a hard map, in my opinion, I would also suggest adding more variety to the types of blocks used in the parkour.
Block examples: Enchantment table, Slime jumps, Soul sand blocks, etc.
Add a little variety and it will really spruce up your map submission, trust me.
Good luck! :D