This app was mentioned in 7 comments, with an average of 1.43 upvotes
Weapons Throwing RPG https://play.google.com/store/apps/details?id=jp.yuika.rpg_en is free. It has energy that you can gain over time, but that's a good thing in my book, otherwise I might end up playing it too much :)
I liked Weapons Throwing RPG for that. Each level is only a few minutes.
Anything similar to Weapons Throwing RPG: https://play.google.com/store/apps/details?id=jp.yuika.rpg_en
Or the Gurk series: https://play.google.com/store/apps/details?id=com.larvalabs.gurk3