[nerdbeere]

Also mindustry (1) which is a factorio-like game with tower defense elements. Great game and still in active development.

(1) https://mindustrygame.github.io

[lawl]

Mindustry is such a great game. I bought it for like $4 when it was on sale on steam, and played it for >200hrs.

Can definitely recommend, it beeing open source is really just the cherry on top.