Jump: X, Shoot: C, Move: Arrow Keys
The game you (hopefully) see above is not done in Flash. It's pure HTML5 and Javascript. You don't need any Plugin to play, just a good Browser.
I made a short making-of video that explains some things and also shows the level editor in action. You can read some more technical details on my blog.
The HTML5 Game Engine behind Biolab Disaster is now available at ImpactJS.com. This also includes the Weltmeister Level Editor.