Bubble Scratch (Adobe Flash, 2013)
Bubble Scratch is a Flash game on Scratch by griffpatch, one of the site's most well known users. The game is effectively a Puzzle Bobble clone comprised entirely of Scratch's default graphics and 10 endlessly looping levels. Still relatively impressive for a game on Scratch.
There are unused graphics for a purple and green bubble, containing a starfish and flag respectively. There are also corresponding purple and green stars. There doesn't seem to be any code left referencing these assets as of v0.9b.
Initial (public) release.
Released 5 days later after v0.8, it added a score counter, a limit to how many shots you have per level, and a placeholder end screen to indicate all 10 levels have been finished (the game will still continue after that however). It also fixed a bug where some bubbles wouldn't fall.
What differences are there, if any?
It is unknown what is different in this version, when it was released, or if a "0.9a" exists - the changelog does not mention this version or 0.9a at all.