Thanks everyone, it still takes me by surprise that this crazy plan of mine is working
@wnm Most of my sign ups come from Google. When I first launched BugMuncher I put a fair bit of effort into SEO, so BugMuncher has always been on the first page for terms like 'feedback tab' 'feedback widget' etc. I've had a few blogs write about BugMuncher, which has obviously helped, and I was lucky enough to get a post in The Next Web when I first launched. Posts to Hacker News, Reddit, etc have also been fruitful.
@shanelabs I wish I knew. More marketing efforts, improvements to BugMuncher itself, and better onboarding have definitely helped. But I think the main thing is simply being full time has allowed me to respond quicker to customers and provide the kind of customer service that bigger companies can't/won't offer.
@michal_hantl I think that would definitely be better than keeping it as a side-project. However, knowing that I have no job or freelance customers to go back to, so failure is not an option, has really helped give me the drive to make it work at all costs.