Yes, I am necroing a 5 year old thread.
But I recently played a few great mobile games, which some might find interesting.
Recommendations:
1) Rebel Inc
You might have come across this strategy game, since it's been in the app charts for quite a while. While the easy and medium difficulty may not really test the average RB member, brutal difficulty is another story, especially if you try different leaders. A try for a mission usually takes 15-20 minutes, which I feel is good timeframe.
What I personally love: There are in-app purchases for new commanders, maps and even cheats, but you can unlock them all for free, if you beat certain challenges. I think it's a nice touch by the developers to say: "Well, if you relly know how to play our game we will give you the additional content for free!"
iOS & Android
2) Super Hydorah
This is a SHMUP for consoles, but there is a port for iOS. Usually I suck at these kind of games and don't like them a lot, but SH has two different diffculty modes: A traditional one for the hardcore players and a "casual" one, which is still not completely easy, but allows for unlimited mission restarts and better shields. Be sure to check it out, it's a lot of fun no matter your skill level:
Link: (because the forum for some unknown reason allows only 1 embedded video per post)
https://www.youtube.com/watch?v=pi-xu06RdO8
(the scan lines can be turned off ingame, IIRC)
3) Grimvalor
This is a 2D platform/action game, which was obviously inspired by "Dark Souls", but the difficulty is a lot lower (if you don't miss the important upgrades
). Still, the atmosphere is very nice for a mobile game and I can absolutely recommend it:
https://www.youtube.com/watch?v=ja4MyxIDyG0
iOS & Android