Spoiler
The one major problem I have with the game thus far is your starmaps are saved to your "server" and not your character. I unlocked Delta and Sector X on single player, but when I wanted to go to those on my friend's server, I had to craft the boss summoning items, kill the bosses again, and craft the starmaps again just to be able to go to Delta and X on his server.
Nevermind that the bosses only drop ONE of their items, which encourages solo play, which made our other friends get upset about being "left behind".
EDIT: Reached the "end" once again on an Apex this time. Balancing still needs a lot of adjusting at Threat level 5 or 6 and beyond. Monsters end up reaching the status of being able to 1-2 shot you again, but they take 3-5 hits to die. I was on a Threat level 10 planet in full Violium gear and monsters were hitting me for 90-100% of my health.

