its a cool engine but if you want you use bigger sprites around 124x124 then i would use RGMv5 thats the newest up to date version of the engine but the one i used to make my game is the older RGMv3 one because i wanted to use smaller sprite sheets.
i think RGM5 gives a extra sprite animation frame so they look smoother that the older RGM does not add pretty much there is two versions of RGM and depending on what you want to do will be the better choice
