i have a question, are the broom/ closet isn't available in demo version?
The demo version of the game is limited to five lockers, one animation set and three infection types and their related upgrades.
Thus, the closet, elevators, and other are sealed in the demo. You are not seeing all animations available in the locker either. You also do not get access to unlocking infections like the auto grabbing tentacles and other tentacle types.
Ah.. probably a little bug. Does not matter much ;)
Yes, the game is on Steam https://store.steampowered.com/app/2345770/SuperPantsu_Tentikun/