This app was mentioned in 4 comments, with an average of 4.00 upvotes
Did a google search for "nerdcubed pi fight" and this is the (dead) link it gave me: https://play.google.com/store/apps/details?id=co.uk.nerdcubed.pifight&hl=en&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dnerdcubed+pi+fight&pcampaignid=APPU_1_TV2EW5-oG8vGwQLB75eICA
It's also not on https://www.nerdcubed.co.uk/games/
looks a bit like a copy of this.