This app was mentioned in 19 comments, with an average of 4.32 upvotes
https://play.google.com/store/apps/details?id=com.colepowered.concretejungle Concrete Jungle is an amazing value that's really made me enjoy the strategy in it and consumed many hours of my life, well worth the $5. Crashlands is another golden premium game if you enjoy survival/crafty sorta games like Terraria or Don't Starve. If you enjoy TCG's, Plants Vs Zombies heroes is an underrated gem, better than Hearthstone for sure. $10 could probably get you a decent head start for your collection and make you some basic decks.
I'm not really into the genre, so maybe not quite what you are looking for, but one that I played for awhile was : Concrete Jungle (puzzle, city builder with merge mechanism)
https://play.google.com/store/apps/details?id=com.colepowered.concretejungle
It appears that the linkme bot is on holidays, so...
https://play.google.com/store/apps/details?id=com.colepowered.concretejungle
Concrete Jungle has some if these elements. A fun, city building puzzler :
https://play.google.com/store/apps/details?id=com.colepowered.concretejungle
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Concrete Jungle is a hidden gem
https://play.google.com/store/apps/details?id=com.colepowered.concretejungle