Distance, one of the best racing platformers (seriously, I love it) just had another update with Refract giving it more free content.
The "Electric Update" was released yesterday which gives you six new levels to try out, a new Main Menu level "Ambient", new music, some remastered music for Nexus (Resonance, Deterrance, and Terminus), new options for SpeedRunners like a timer, improvements to the built-in level editor including 17 new textures and bug fixes.
Distance is another that's seen an impressive level of post-release support, which is awesome as it's such a fun game and it's incredibly stylish too. Some of the levels really are challenging too, with tons available on the Steam Workshop once you've finished the healthy amount of levels that come with it. Looking at the Steam Workshop today, there's thousands of levels it's quite ridiculous and some of what the community has created is seriously good too.