shapez.io is fun (and GPLv3 <<a href="https://github.com/tobspr-games/shapez.io">https://github.com/tobspr-games/shapez.io</a>>), Shapez 2 is tons and tons more fun, IMHO, although currently only out in Demo <a href="https://store.steampowered.com/app/2162800/shapez_2/" rel="nofollow">https://store.steampowered.com/app/2162800/shapez_2/</a>