This app was mentioned in 4 comments, with an average of 1.25 upvotes
It's a game where you move around as a cube to fall into a hole. That's massively oversimplified but it's the core concept. Screenshots and free trial here.
https://play.google.com/store/apps/details?id=net.mobigame.edge.demo
this was what I was thinking of. Not sure if it's the game you played