Nice site. One thing I came across:

Your code validation checks for necessity without checking for sufficiency. In other words while

    "hello world"

will be accepted. So will something like

    "hello world""

Also, when I attempted to deploy some 'malicious' code it didn't deploy (great), but it would be nice to get some message as to why my deploy failed.

Small things but something worth accounting for since the goal of the site seems to be making taking that first step as pain free as possible.