Hello Mika!
I am here to tell you my opinion of your map. Please remember that I am not a Map Judge and my opinion does not affect the judging result. If the Map Judges disagree with my opinion they will go by what they think!
Firstly the THEME of your map. I don't remember this thing ever being as a map, and I honestly respect you picking such a different theme. Original and a great pick, well done!
Secondly the BUILD of your map. After looking at reference pictures of how the real thing looks like, there seem to be many different versions of the Cross, but I did find the one you replicated! It is accurate to the real thing, and well built to me. Great work with the build!
Lastly the PARKOUR of your map. To me, this is the biggest problem of your map and the downfall of it. I didn't find it enjoyable to play myself. It was varied, and fit the aesthetic side of the map, barely making the build look messier, so well done on that aspect. However the parkour is very sluggish and filled with corner jumps because all the parkour is attached to walls. I understand that this is inevitable in your build, but I still believe you could have executed the parkour better. The map is also built on the wrong facing for Hard maps, (your map is Z, when Hard maps are facing X) which makes the parkour be different when the map is rotated. All X corners turn into Z corners and vice versa. I would also work on the Parkour because the way it is now I find to be WAY TOO DIFFICULT for the Hard difficulty, feeling more like a middle ground Expert.
I'm giving the map a 0 for now, because the theme and build are good and I believe you can work on the Parkour to make it better. Good luck : )