While I do understand that you made it, and that isn't finished, I have quite a few suggestions *these definitely aren't the best I can think of but oh well*.
1. The islands are very bare of anything on the top, maybe add more details to the top of the islands, such as leaves, crafting tables (in the ground so people can pvp) and disperse the chests more.
2. Speaking of more detail, maybe add more detail to the cubes, like more colors (meaning for blue, different blue blocks), and maybe not a red/blue pattern. It would be interesting if three were blue, three were red, three were yellow, and three were green so in tsw you could easily tell your color!
3. Ik I've gone on and on about detail, but maybe add clouds underneath the islands? It's a weird suggestion, but it may have some interesting results.
4. *I was gonna talk about the island shape but then I realized it's called cube and my mind had a huge stall*
5. Could you post more pictures of the middle please? Ik its not done (again) but it doesn't look like it has a big amount of pvp space.
6. Sooo I was looking in your inventory and noticed saplings, maybe you could try and make your own trees.
@wishing posted an amazing tutorial on how you can do them!
7. The islands look to be in a square pattern, maybe make them into a more circular shape.
8. *I will post more tomorrow*
Sorry if my suggestions are bad, I'm not really a skywars build expert xD
Overall, it's an interesting (and very simple) idea, but it just needs more details in order to make it a cool map.
