honestly, the minigames in Warframe like Wyrmius, Flappy Bird, Fighter Frame all should be playable by the app. Even a 2d game like "Lost Sector" (that lil game they worked on for phones a few years back that was Frost kickn as old school style) wluld be a dream come true. I'd even PAY real dough money to play this out of the Mobile App as a DLC or unlock.
It would be really nice to create companion mini-games like even a cheap 2D kubrow fetch game or hell, make them into digipets through the app where you can feed/pet/play with them all day mobile before you get onto warframe lol