1. The tunnels are extremely long.
2. Um, I found it straight from spawn, it was literally a room connected to it.
3. Inspired is fine, as long as you make it your own. Several players have also said that it looks a lot like Lost Mines. Too much IMO.
Example:
You said this map is kinda like Solar Frost. The fact that you changed the theme, yet the style is similar is fine. Since you made it your own.
4. Then upload your updated version
5. Icarus and Moonbase were built by Redforest and Team Elite, which are massive build teams. You had only a few people. If they worked all day for two days, yes they could get it done with all the members they have.
6. Because there is no reference point other than stone walls, no sense of direction. So when you come out at a new area, you don't know where it is from spawn.
This was meant to be constructive feedback. Next time I will just tell you your map rocks to make you happy. I never asked for a moderator to delete it. Positive feedback, spawn looks cool. (no joke) My day has been great.
Edit: If you put another few days into this, it could be a good map.
Another Edit: I was treating it like a map that is applying to be an MCSG map, and comparing it to the standards. I don't believe it currently meets them, but like I said, with a little more work maybe it could.