It starts with a framework plot, so it is already head and shoulders above it's inspiration, Tentacle Locker... 
In my opinion, needs to bee fleshed out into a full game, where you have goals and advancements.... Girls tentacled should become minions who help drag other girls to lockers, pass that stage and take over the  teachers lounge, conquer the entire school administrators and now the school is yours. 

Game should then proceed to a Map. Take over police stations, shopping malls, fire departments, etc... There is room here to expand the  genre a little bit... Men could either  be mysteriously absent from the town, or converted through tentacular powers into either tentacled versions of their former selves, or (preferably), into futa tentacle minions themselves. 
Conquer the  whole town and you are then set for "Lovecraft Locker 2: Schools Out Forever" Take over the nations and corrupt the world into a tentacle breeding planet!