sorry I didn't reply sooner, didn't see this comment until now. Yes, there will be rooms like that.
Awesome! That's one of the main things that I've wanted!
This can be considered less of a suggestion and more of just wishful thinking, but another idea I had was the inclusion of dimensions that correspond to the areas from the 2D Metroid games (Namely Crateria, Brinstar, Norfair, etc.) with the only access to them being elevators hidden inside of rooms that require a certain beam/upgrade to enter. Within these dimensions, you might find Save Rooms (to temporarily change your spawn point), Recharge Rooms, and enemies that correspond to their respective areas, along with item rooms, of course.
you need to open the jar file (use 7Zip or something like that, jar files are just zip files with a different extension), go into "metroidcubed3/asm", and delete 'MC3ASMClient.class'
Is this a fix for the game booting you and being like "server issue" or whatever in SP when using charge beams?
(sorry if im asking annoying question, i didnt really follow the chain of replies / posts)
No, not donation related. I'm looking into it atm.
EDIT: all evidence points to a panel shutdown, where the computer running the server powered off. I have started the server back up, hopefully this doesn't happen again.