I am making a polished Platformer Game and would like a team of people to make the game, a way that you can work on the game is if you make sprites and upload them or make code and upload it of make music for the game and upload it.
As a platformer game as my first game I can tell you that you can use flowlab sprites or diy it use normal music flowlab has and look at tutorials
You can also use Bandlab for music (if ur good at composition)
I know, I mean that people could make music or sprites (my sprites are not the best)