The more you play this game the worse it gets. The lag, starting around 50-60~ish dwellers becomes progressively worse the more you add rooms and dwellers- which is the main objective of the game! Trying to just scroll around the screen constantly (and I mean CONSTANTLY) means that you will inadvertantly grab and move dwellers. Sometimes the focus will randomly fling itself completely off to the side when you are scrolling.
And a bug that I've recently discovered (now that I'm paying attention to raising happiness) is that if a dweller gets killed- everyone else in the room remains unhappy even after you revive the dead. They constantly complain about being in the room with a dead dweller. I've tried moving everyone, destroying and rebuilding the room, killing the dwellers- I've heard that if you cause the revived dweller to die in the room again this can be fixed but so far I can't get this to work. Especially if the room they died in is a training room. There's no way to Rush these rooms so you're screwed, even if this "fix" worked. As far as I can tell this has been a problem for months.
When in a battle scenario it is sometimes impossible to heal wounded dwellers when they line themselves up behind each other. Sometimes they'll randomly move to an area that allows you to heal them... usually not. If they die guess what happens? The happiness bug listed above. Just make these idiots pick a spot at varying areas that don't block one another- sometimes you have seconds to heal someone, especially low level dwellers during a deathclaw attack. There's no good reason to keep them randomly running around during a battle and invariably getting in the way.
Another maddening problem is that if you revive someone during (or maybe even after, I'm not sure) a battle they entirely forget what room they were in after the battle is over. They'll end up wandering through the vault on a coffee break until you find them and move them back. If this happens in multiple rooms then you have the added fun of trying to figure out where they came from! It's like a minigame! Isn't that fun? No. No it's not. This is a stupidly annoying bug.
Funny how Bethesda can add goofy, useless stuff like holiday themed rooms and outfits but not fix the core game.
The egregiously callous behavior of allowing bugs to continue for months on end (in a relatively simple game) should not be rewarded and no one should give another dime to this company until they attempt to fix these and apparently countless other problems that can be read about here. But this request is me basically yelling at clouds because they have no need when the ignorant masses keep throwing MILLIONS of dollars at this broken mess.
I'll offer at least a couple easy solutions:
For the lag: let us turn off the useless room animations. Do I need to see steam and flashing lights? Or rats in empty rooms? No. Give us the option to kill this stuff. It might help a little.
For accidentally moving dwellers: Give us an onscreen toggle that lets us turn off the ability to move dwellers. Problem solved. Tap it to turn on the ability. Tap it again to turn it off after moving who I want. Ta-daa! Problem eliminated.
At this point though I'm done. I spent countless hours and good chunk of money before figuring out that I was playing a broken game. I'm uninstalling it and moving on with my life. I figured that on my way out the door I'd hopefully warn off potential players and hopefully nudge the devs to fix the game for future players that may end up continuing to pay (even more) money for a game that actually works properly.
Yeah. Right.
It's obvious that this game was an afterthought that was only meant to provide marketing for Fallout 4. Suddenly they found that it was, and continues to be a cash cow. Congrats.
Now fix it.
(I'm using a nearly new Galaxy Note Edge phone btw so I'm not trying to play on some clunky old underpowered piece of crap.)