This game has a lot of potential!
I like how you take your time with reaching the shrinking stuff, and you add just enough character details and development to make everything much more engaging.
And the way you set up the story invites tons of possibilities. You can add in extra characters (which you hinted at already), include different locations, and try crazy scenarios since you've put the shrinking directly in the hands of the characters.
Also, I like how you can actually exhaust the dialogue options. Nice touch! Another small feature I liked was that, right after shrinking, the dialogue goes from very large, to not so large, to normal, signifying that the player is slowly adjusting to their new size.
I'm really looking forward to future releases, and I'm honored that I inspired you to give a shot at making your game. Keep up the great work!