Big Room & Little Me
 

https://www.youtube.com/watch?v=XvzMF9jpmjw
https://www.youtube.com/watch?v=a7bTf9-E5cY

I just found a cute pair of puzzle games on the Google Play store. They're about a girl who wakes up to find she's been shrunk and has to solve a series of puzzles to unlock a chest containing the potion to make her big again. If you don't have an Android-compatible device, you can watch the video walkthroughs I've provided. No real process, but there's a lot of cute images of the girl interacting with her environment.

Also: (spoilers in white) The final stage of the second game has her drink a potion to become even smaller and revisit the previous stages to find cards in places she couldn't reach before.

Re: Big Room & Little Me
 

Well that's a neat find! :)