Frankly, I agree. Sileo was my first proper writing project, and with hindsight it's easy to see a lot of what's wrong with it. I've grown a lot working on Sileo, and one of the most difficult aspects of that growth is looking back on prior work for my current project and realizing it's no longer up to the standard I hold myself to. The standard continually rises, and so older works consistently fall short. I've already committed to remaking certain older content and even teased some other possibilities... the scope of which stretches to the majority of everything I've already done.
I don't know if I'll ever be completely happy with my work, but so long as my work continually improves, I can take solace in that.
I am curious about what aspects you felt were visually lacking, however? Sileo is a collaboration as opposed to a visionary working with hired contractors, and so artwork costs and such aren't a factor in our pipeline - we've frequently produced bespoke CG artworks, backgrounds and even sexual scenes for things many other projects would consider a wasteful expense solely because our artist CurryCatz was paid a share as part of the team rather than being commissioned. I am however acutely aware personally that our visuals tend to be especially static, an animator is at the top of our list for who we'd love bring on board our team, but we've never been in the financial situation to be able to do so, especially now with how hostile everything is to NSFW creators. Either way, I'd genuinely like more feedback on why the visuals weren't to your satisfaction - it's a genuine surprise to me, as I always felt our VN had visuals well beyond what a 2-person project usually would. The insight could help us to improve things in the future.