Real racing 3 dont have any display settings, it auto adjusts according to hardware. Adreno 302 is a good GPU so I guess it should run at mid/high settings but at least not low.
You can go to settings and change installation location to SD card and put game data to sdcard/android/data/<game-data-here> and install apk.
I think real boxing should work on your phone. Actually all games for android run on android IF android OS requirement is fulfilled but their performance will vary from device to device. Such as graphic settings, fluidity, lag.
Yeah in some cases google play have shown me "this app is incompatible for your devices" but I have downloaded games from other sites and it worked.