Congrats in getting launched - it's always the hardest
We've been doing customisations to JobRoller and if you want to bounce a few things off of me, just shoot a pm.
As for your website itself, there's not much I can fault it on - largely as it uses the box-standard template that comes packaged with JobRoller. While this is definitely good quality, it's hardly unique and you'll find that users might have seen the exact same job board (at least look & feel wise) elsewhere. To that end, my recommendation would always be to customise as much as possible (skill / budget permitting).
Something you might be interested in, and at the risk of shameless self promotion, we've recently released a child theme for JobRoller. In essence, a child theme is something that sits on top of your existing jobroller installation and changes the look & feel completely, while keeping the functionality in tact. If you're keen on a demo, check out the link underneath (entitled Prima) in my signature area.
Shoot me a message if you've got any questions