Between November 1st and December 1st, GitHub organised the Game Off 2020 where programmers submitted their own original games on the theme moonshot. There were 500 submitted and you can view them ordered by score here.
The top scoring entries are shown here on GitHub which also explains what programming language and toolkits were used. It’s interesting that of the 500 entries more than half were for Windows and approximately the same number are browser playable. The breakdown is Browser playable (262), Windows (252), macOS (108), Linux (96) and Android (8).
The GitHub link shows the programming language and C# + Unity seems to make up a large proportion as well as Godot +GdScript. But I haven’t been through them all and it would be nice to see if there are any that are C + SDL.