I like it, but I'm seeing some serious similarities to chrome. If I had not seen this announcement and I quickly glanced at those screenshots, I would not think it was Firefox.
Pretty good. A small tutorial or help page in game would go a long way though... plenty of users will install without thoroughly reading the description.
They call it "open", then turn around and charge ~$50 to access the web-browser version of the sim for a year? Doesn't feel very open to me.
I recognize just how important C. elegans is to neural/bio research, and how ambitious the project probably is. I just think this would be so much cooler if they were offering it to all curious minds free of charge.