Good news/bad news. The good? The game ran flawlessly on my G3 without any force close, though it's not my cup of tea. Bad? You may have some other issue with your phone. Possibly something you've installed is interacting with the game(s)? Are you using ART, it's still beta and can have issues with some apps? I didn't have any issues running it, but switched back to Dalvik after rooting because xposed doesn't play with ART. There are differences in our G3's , I have 3gb/32gb and we have different radio frequencies but that shouldn't make a difference here. In my experience, custom roms/kernels add function, speed and battery life but more often than not at the cost of stability. Waiting for a custom rom to fix your stability issue might not be the best strategy. Good luck squashing your bug!!!
---------- Post added at 12:49 PM ---------- Previous post was at 12:41 PM ----------
On line reviews have shown that frame rate can be affected slightly with some games, but I've yet to use an app or game where this was noticeable in real world use and most of those same on line reviews have stated the same. Every game I've played has run fine and looked good...every one! QHD may have an impact, but "underpowered" is a bit of a stretch.