I've tried it on chrome now as well as Cyanogenmod browser.
You've described it as "a very simple starter wallet for mainstream users". I think it will serve it's function very well. It's going to seem like magic to people once they've tried it to send bitcash!
When I first tried it I put my name as 'hadriantest', but my ID showed as 'hadriantest1' on what you might call the account screen. Then I tried it on a different browser (chrome) and entered my name as 'hadriantest' again. This time my ID was 'hadriantest2'. If this is to do with account names being already taken, perhaps there should be a prompt or message for the user. Also, I'm not sure why I wasn't allowed 'hadriantest', because it's not taken - do you automatically append a number?
More feedback to do with inconsistencies in the way the sending amount is displayed. A couple of examples showing input and resulting output:
1 -> $1
1. -> $1.00
1.0 -> $1
1.01 -> $1.01
Also:
1 -> $1
1. -> $1.00
1.0 -> $1
1.00 -> $1