can I use the game engine Roblox studio?
We would recommend against using software that would make it harder for people to play your game (idk how roblox studio works and if you can make a standalone game in it) - and we especially encourage people to make web/browser builds because it would realistically mean that a lot more people are likely to end up playing it in context of the jam - but feel free to use the tools that you want to use!