I'm in for the third time, with my own game engine, as usual : http://squarity.fr

If you are curious, here is a video of my latest game made with it. It's a sort of minimalistic RTS where each of the 2 players use only 2 buttons.

I play with my son and explain how the game works, while he sends missiles on my bases. (French speaking, sorry).

https://www.youtube.com/watch?v=-I8D6GN44x4