There is issues with Blender editor when workign with million poly models and high rez textures.
Re opening the level all duplicated models where stacked at the same position loosing all level design
(perhaps it’s related to objects transforms or other things, but that should be saved and opened correctly).
Doing some level design again, saving and close editor, re opening and again same issue ( trying the Blender backup file, but it’s the same ).
I don’t think keeping working on the project or fight with some Blender editor issues.
Perhaps i’ll give it another try again much later when Upbge 0.3 will get advanced game particles and good post effects.
This is more an Upbge tech demo showcase than making a full game.