PookaMustard: TL;DR - mobile games have their potential and reputation trampled on by AAA devs and I think they're better than how it is generally thought of. 
 Charon121: Could you recommend some? I'm particularly interested in RPGs, maybe even "visual novels" (Western ones). 
 For free strategy games, I recommend Antiyoy. It's simplistic, but that's what makes playing it for hours on end look like a prospect. Underhand seems like a good card game, also fully free. For visual novels, there's plenty on Android but don't expect to find stuff like the whole Higurashi series, and Western even less. For solitaire card games, Simple Solitaire Collection will suffice, also open-source.  
 For paid stuff, Reigns is a good card game where you select between two choices, either of which can lead you to success or failure. The Lifeline series is nice, and while there are lots of waiting times before you can lead your characters in the series, they're there to add to the suspenseful feeling of the game and not to extort cash from you. Geometry Dash is pretty much a runner game with 21 or 22 official levels and so many custom levels to choose from and build your own. I haven't played that one, but Pocket City is pretty much SimCity without EA's greed all over it. Mini Metro is a good and simple simulation of building metro stations, including failure.  
 Of RPGs, I have only played the Final Fantasy ones but they're solid unless you have issue with V's and VI's graphics. You can also just emulate them with NES/SNES/PS1 emulators (RetroArch is a good start if you want all three). Sorry I couldn't be more precise in the areas you were most interested in.