Currently I'm playing Stardew Valley on my FireHD10, I never played a mobile port that had THAT good controls.
I also got Terraria and Minecraft and they are pretty bad to play with awkward on-screen controls.
Does anyone here know of games that have good mobile ports? Or even good mobile games to start with? Most "native" mobile games just were really basic, full of in-app purchases etc. so I was looking more into ports, but if you know something good, let me know :D