Yeah, although the build isn't terrible (I really like the barn/house), the rainbow, nether, heaven, etc themes have all been done quite a lot.
As piebrian mentioned, the parkour is very floaty and repetitive, as well. You've got slime, ice, soul sand, trapdoors, fences, gates, walls, heads, vines, ladders, enchantment tables, beds, cakes, and far more at your disposal; why not try to incorporate them into your parkour and make some really unique maps?