Roblox is a platform where developers are able to use their tools to easily make their own game using their service, allowing for an easy creation of a multiplayer game. Obviously many people will simply try and make cash grabs (Majority of game websites) but that doesn't mean there aren't any games that took actual effort to make and are very well made. Honestly give this incremental game a try, its a pretty large one that your gonna spend lots of time on and the game will only get larger.