I just heard, You can buy.. Premium is so important, which in my mind translates to..
Give us 40$ for this game and we'll see how hard we can milk your wallet.
Do they really expect people to have a 150$+ to spend monthly on their favourite games? It's almost like every game today is 15$+ monthly + a lot of micro payments on top of that.
And if you want to play for free, they'll make the game so painfully slow to progress, that you'll likely end up blowing your brains out just from boredom!
i tried Project Spark while it was in Beta but really it seems like a money making schem by Mircosoft more than anything else ... if you want to make and share games for free ROBLOX is a actually free altertive just you will have to do the AI scripting yourself IF you even want the enemys to do anything like an AI that is.