Things the player can "do" are under careful consideration going forward. We're bouncing ideas back and forth and considering all options. Current plan is to de-emphasize direct combat, but give the player key strategic abilities as the game progresses (besides summoning & feeding demons).
Other possible resources: picking up coffee to feed sleepy demons (instant sleep restore). Also lowering the amount of time smaller demons need to sleep will improve the gameplay.
Likely additional commands, abilities and/or spells will be forthcoming..