This app was mentioned in 3 comments, with an average of 2.33 upvotes
Didn't want to give the wrong impression; it's fun until that paywall. You can still get decently far in it for free.
Not sure how to link using the bot but here are a few. Just note I think Battleheart is simply better than the others.
Pocket Heroes: https://play.google.com/store/apps/details?id=com.droidhang.ph&hl=en I beat it without paying, but it can be grindy if you aren't willing.
Heroes vs Monsters: https://play.google.com/store/apps/details?id=com.trinitigame.android.hvsm&hl=en He
Cowboys and Zombies: https://play.google.com/store/apps/details?id=com.obv.google.howdyzombie&hl=en