Steam integration
Would be great to be able to play with or against steam friends. Depends on #2031
This official SDK needs to be implemented -> https://partner.steamgames.com There's also a $100 fee per game.
And actually having the project being Greenlit afterwards. On steam projects it has over 70% approval rate, so that's pretty good and encouraging. It would make it easy for people to tag along with existing friends and also advertise the project a bit.
Not really needing online multiplayer for having this on Steam, but it will sure help no doubt. One step at a time. Looking into number of votes required for GreenLight and such https://www.scirra.com/forum/how-many-votes-on-steam-greenlight-to-pass_t164123