Look at the third image. The 4 is too big to swipe down. Same for both 3's and the 2.
Look at the last image. Those are wormholes.
Other elements include - directional arrows and +/- tiles, which I'm not crazy about.
Grow - Expand & Conquer is one of those games where I want to solve every level. Unfortunately, there's been a slew of other good games that I have to play. But I have solved about 75% of them.