The editor works fine, you might want to try and start using a grid system with it though. Like take the x size and z size of each wall and make that the grid size. Maybe just draw a matrix, turn grid on and don't apply a texture. Then figure out a way to lock the current mouse x,y to the nearest grid. That would probably speed up development of levels.
Is there a way in the editor to delete objects or am I just dumb?
Other than those two, I'd say it's fine. And I like the selection objects with the arrow keys, the only I'd change about that is maybe not reset the x,y everytime the user changes the object.
Good work, this title is coming together. Now I gotta go work on mine!
P4 2.4Ghz HT, 512MB RAM, ATI Radeon 9600 128MB, 19" Samsung SyncMaster 997DF, 80GB HD