I keep checking in now and then to see what's happening. Happy to see the project is still very much alive… for you at least, I've not played in 7 years! Hoping to reset that once I get some new content and tyres.
The longer I work in games development the more I understand your decision to work this way, and also appreciate the time taken to develop. Progress seems slow at times even in big teams. I'd not have the commitment myself to work on one project for this length of time and certainly not by myself though you do seem to have at least chosen the right niche to get a (comparatively) patient community.
I'm assuming you're still not using source control?
I think that sums up every project I've worked on in this industry.