This part of a post from fight intrigued me because I am a one trick pony on my iPhone playing basically only MPQ (Also, I recommend having a spare go-to game for times when you feel content or progress is lacking.)
So what are some back up games that I should try?
Yeah, usually once the original comes out and performs well, the sequels get greenlit and put into production fairly quickly. That’s usually the case when such productions are inspired by IKEA, HGTV and Pintrest. 
I took an inverse direction from OP. This season I decided that I would no longer play MPQ when I had other viable options. That is, when my PC and/or PS4 were available to me, I would play those instead. Not only have I become much happier getting to those games that I’ve been putting off, I enjoy MPQ a whole hell of a lot more, too.
To go in the same direction as OP, FTL remains one of the finest games I’ve played in the last decade. Maybe one of the best games I’ve played, period. I cannot recommend it enough, especially if you’re not one of these sissies that complains that games are hard. Because it’s hard.
Lately I’ve been playing through the dark souls series.
Now it’s a million miles away from MPQ but I’ve never played through them before, because I was put off by the difficulty. It’s not actually that hard.
Seen FFVII is now on Android so I’ll probably replay that at some point as well 
I’ve been playing the dozen or so games I backed on Kickstarter that have just been gathering dust on my desktop.
For a while it was Hearthstone. Throw in some FTL and Don’t Starve for good measure. I played Adventure Time Card Wars for a while and MTG:PQ for even less. I just recently got Elite: Dangerous for the PC. Now I can fly my spaceship around AND finish a few battles in MPQ.
What I really should be doing is taking a queue from this thread: Has anyone tried playing MPQ while walking on a treadmill? - MPQ General Discussion - 505 Go! Official Forums
Dark Souls/Bloodborne are effing incredible. I played the crap out of all of them. Just wish the PVP was hashed out a bit better.
To the OP’s question, I played Star Wars Galaxy of Heroes briefly. Holy smokes, if you guys think MPQ ever looks like a cash grab…
Severed was pretty good on mobile as well. It’s also like 5 bucks and then you just, like, own the game. No getting nickel-and-dimed with in app purchases every ten minutes.
Recently I’ve been replaying XCOM 2, this time with a whole slew of mods - they eliminate the “you can win but only barely” level of difficulty but they’re pretty fun.
Its my first time writing in the forum as i trolled it for the past 648 days of MPQ play. Season XXX just ended, and Web wonder PVE is only playable in the next 12 hours and Nefarious Foes is almost the same (my preferred time).
My back up game is Clash Royale and currently at Arena 7.
The other one is COC..which my town hall was just upgraded to level 8.
Also playing NBA2k15 with my brother if totally no phone games. 
None. MPQ is my only one.
Since I’m playing on Steam I have a library that has 500+ games.
Ran through Skyrim, latest arkham game, Diablo 3 recently. Trine 3 is up now that I’ve run PVE deep enough.
I like RPGs, so I have khux and ffbe. I just saw there’s another f2p ff out called mobius ff, so I’ve downloaded that, but I haven’t started it yet. Also I downloaded One Piece Treasure Cruise, but I haven’t started that one either.
Some day…
Just kidding
MGS 2-4, Dark Souls, Minecraft, Logo quiz, Sudokus, UNO, Remember me, Final Fantasies, Duel Masters, Mastermind etc
Super Stickman Golf 3
The paygate for the Remodel game is way too high for me.
80 Days is a good mobile game with a good amount of replayability. It’s like a choose your own adventure version of Around the World in 80 Days.
Pokemon go. It is incredibly addictive. Also they made some updates to it so that it’s easier to catch rare pokemon.
Also you get that nice vitamin D spending time outside for a while.
I play MtGPQ as casually ( or as seriously ) as MPQ.
Used to play Spider-Man Unlimited from Gameloft, but had deleted it.
All of Inkle’s stuff is great. If you’re a fan of the Sorcery! Fighting Fantasy books from the 80s, their adaptations/reinventions are truly something spectacular to behold.
There are SO MANY amazing games on smartphones and tablets. I urge everyone here to grab the TouchArcade and AppShopper apps, get browsing, and take a punt on something different.
I play MPQ on my PC, so… Arma 3, King of the Hill mode.
I early adopted Civ 4 & 5 (and picked up expansions for both along the way) - and generally a regular Civ player for a long time. Civ 6 is looking set to have an incredible start, given that they’re keeping a lot of the updated/expanded mechanics from 5+ in the launch product. I’m also very interested in the new take on “de-stacking” the cities. I tend to play science/culture Civs with 2-3 strong cities that feed into each other, and generally have a hard time against aggressive military expansionists that use city spam to block off land. I hope that this changes that, at least a little - city spam still likely valid but keeping them within 2 spaces is going to limit their usefulness moreso than now.