This app was mentioned in 10 comments, with an average of 3.60 upvotes
First thing that came to mind was The Impossible Game but upon further inspection, you're piloting a square, not a triangle.
It's the name of the game. So there is that..
https://play.google.com/store/apps/details?id=com.flukedude.impossiblegame&hl=en
Are you thinking of this??
https://play.google.com/store/apps/details?id=com.flukedude.impossiblegame
Real gangsters played The Impossible Game https://play.google.com/store/apps/details?id=com.flukedude.impossiblegame