Hey, I’m Honey. I’m working on a game and I was wondering how many parts should I have at the maximum. I am going to try and make it accessible on a computer, phone, tablet, and Xbox in the future. Thanks!
P.S. If this is in the wrong catagory please tell me 
For parts, you really don’t have to worry too much. It depends on your style as well, because if you’re doing low-poly styled builds then they will perform much better than a high detailed build. I recommend just doing a simple low-poly build, and try to have your game be in a cartoon-like style. Those games usually work the best for performance. If you are doing something with higher detail, I would just say keep the amount of parts consistent and don’t build anything or make anything in areas that won’t be seen (i.e. if you’re creating a skyscraper for your city, make it out of one block instead of four walls). Hope this helped, and good luck!
I think around 5k parts is the limit. But keep in mind that the amount of memory and performance bricks take up is nothing compared to textures and images (so try and limit using those). But having a couple thousand bricks will be no big deal.