New ideas at 4/10:
1. Combinations. I think more types of locker will coming up in future, now take the hallway as the standard, 4 lockers in roll. If I make 4 lockers in roll, this 4 lockers will have a passive effect.
2. Similar to the first point above. for example 4 normal lockers in roll, you will gain a effect only on those lockers such as auto abduct the panic girl if in range / auto abduct girls when room free / double length of tentacles etc, 4 gas locker to gain atmosphere effect, to make the area that in front of locker cloudy, make the girls forgot her jobs or remember / sight blocked / inhale those air may cause aphrodisiac effect, two dimension lockers at middle with two normal lockers in left and right, when you abducted girls by this locker to make summoning fast / dimensional locker can abduct girls then low chance summon rare wifu or rare yuri scene / summoning by two in one time. Messy combinations with no effect.
3. Similar to the second point above. Combinations can look farther to one area, not just only 4 lockers. In fact, something similar is already happening, like infect 12 locker to unlock nurse room. Combinations effect needs special combinations, like 4xA + 6xB + 2x C. Different ingredients to make whole area with different combinations effect.
At last, a strong suggestion, hopefully this game can be selling in Steam platform. Steam is allow the game with adult content, also selling the game in Steam can be more easier to promote.