That's impressive. Building a renderer from scratch sounds like one of those projects that teaches you far more than following tutorials ever could. I'll definitely check out the screenshots.
This is exactly how many great products start—solving your own problem first. Also, huge respect for losing 40kg. That's a bigger achievement than building the app itself.
I've spent the last several months building ZFYUCHAR.
The idea is simple: people can anonymously share real-life problems, while others who have already overcome similar situations can offer help based on their own experience.
I'd genuinely appreciate any feedback about the idea, usability, or anything that could make the platform better.