Hi again! CraftStudio was a project I built in 2011-2013 focused on blocky/pixely games. Superpowers was a follow-up with a small team built in 2015-2016, with better 2D capabilities.
Neither of them are actively maintained at this point, so I can't recommend that you use them for anything serious, but to the extent they still work, they can be fun to use and do provide a pretty unique experience with the real-time collaboration.