First of all, an origins block would be nice. An origin block would decide where on a sprite something is emitted, or attached. This would be great for character customization.
Also, you can’t save drafts of discussions on Flowlab forums <–I think this is important to fix.
Second of all, a “recently published” page for recently published games would be nice, and a “popular” page for games that are getting lots of plays and likes, you should also be able to follow someone so you get notified when they publish a game. I feel like all this would help people share their games and it would build a stronger community.
Third of all, shortcuts in game editor and sprite editor for example, Ctrl+z to undo the last changes you made.
I also think it would be very useful to be able to group objects.