Thanks for the feedback! The plan is definitely to add many more locations, including coasts, forests, mountains etc.; that's the core focus of the project. The Steam version will also be getting more car varieties and combustion engine sounds, and I'll try to figure out a good solution for an in-game music player too.
But I think some of what you're describing - racing, items, ramps - belongs in a different game; I'd prefer to keep the scope for Slow Roads tight and try to do one thing well, rather than branch out too much and risk muddling the game design. That said, I have tested both rallying and multiplayer in occasional community events - check out driftmas, the annual winter rally that I run every year. I might keep testing ideas for multiplayer and competitive modes in the future, but for now it's not the focus - first I want to get working on these new locations. Thanks again!