This app was mentioned in 3 comments, with an average of 2.67 upvotes
Grow is one of my favorites, I beat it completely a few years ago.
I remember seeing the dev here and he was super nice too
The fish one that /u/likebuddha mentioned could be Grow
https://play.google.com/store/apps/details?id=com.epicpixel.Grow Found it,you eat fish smaller than you, avoid larger etc, but the upgrades made it fun