I've been getting into "Dead Trigger 2" lately,
It has a good storyline (least in my opinion),
it isn't exactly PG though because of the violence, and the occasional NPC swearing
The only downsides to it is the aggressive ads (which can be removed once you buy something with real money), but ads can be skipped, so it isn't much a problem, and some even reward Gold (is similar to Platinum in STS games). So in general, you don't need to actually spend money to succeed at the game.
The other downside would be the wait times. DT2 seems somewhat like a combination of Build&Battle and a FPS game.
Overall, I'd recommend it.
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