I'm not sure it is,... the lair and garden research very quickly and help you create a bigger army. Graveyard is also available for research, which is effective in a map with limitless enemies. And 5 enemy samurai and a knight every 90 seconds is a bit much for my 3 samurai(I lost one) and single knight to survive and heal from within the time frame.
EDIT: the guardpost is not producing anything, but indeed the 3x3 library could be used to research the rooms. I like that since now my skeletons sleep next to where one of the parties spawn. The vampires at level one are pretty useless though, and I don't know yet how to push on, killing 5 hero parties every 90 seconds is a lot, and I still have o make progress. I liked the level until this point, but right now I find it a bit frustrating.
I did notice you configured a moon-level in your campaign file, but did not actually make a moon-level.