I love it. I just love it. There are some issues that I'd like to see fixed, no deal breakers, just stuff that could improve the general experience.
Bigger menu buttons: On lower dp they may look fine, but at 513 dp on a 5" they are a bit too hard to get consistently.
Customizable/draggable buttons: I'd love to see such a thing: pause button is too small, rear view is too far away from the arrows to be used when needed (also rear view is a meme in all rvgl versions).
Permissions: This shouldn't really be anything crazy, right now the apk tells you the permissions it's going to use when you install, lollipop style, while in recent android versions (i.e. nougat, oreo) the apk prompts you to allow access to whatever it needs (storage, photos, ect... ect...)
Icon: Along with the permissions, the icon should also be updated to match latest android version's standards. Nougat uses circle icons, while oreo takes it a step further with adaptive icons (they can be reshaped from circle to square to anything else by the launcher on the fly). Also, a material design version of the icon would be nice
Medias: Simply make the game add a blank file called '.nomedia' in the RVGL folder (without quotes) so that android's media provider skips the folder and we don't get our gallery apps flooded with rvgl's game files.