The jump variation is very poor, try adding jumps like ice, slime, fence, trapdoor, head, etc.
The cave seems a bit too conforming and well-lit; try carving the bottom edge into a curve and removing some of the light.
Lastly, the theme isn't particularly original, as we already have many floating island maps and many cave maps.
However, I see potential, so don't give up! Take inspiration from recently accepted maps if you'd like, and try a new map.
Good luck!