The product looks pretty good imo. You should start charging soon.
Btw, which one of DigitalOcean's cloud servers are you using? Did you find it reliable for a startup? Also, do you mind telling how many users you have?
For the first month reliability was a bit spotty but for the past 3/4 months it has been really reliable. The only problems I had at first were network latency which they seem to have resolved now.
I'm happy to answer pretty much any questions about my projects! There are currently 1687 users. Signups go in bursts when I promote the site; once I've got a number of improvements done over the next month or so I'm going to try to promote it again.
I'm also really excited by what other people are doing with the codebase. There's a chap in Japan who's managed to get it running for his figurine fan website, which is impressive mostly because my documentation is so shockingly bad :D