Here's three room escape games that involve shrinking the player character at some point. Since they're played from a first-person perspective, you don't see the player character, which means you can imagine any female you like in the role. Just the same, I'm not sure that's enough to qualify for the shrinking section, so I'm posting them here.
Nezumi Mouse Room (In Japanese)
Nekonote Escape 6 - Dream 2
Cube Core