Screeps (https://screeps.com/ https://screeps.com/) is an amazingly great example of this sort of game. It's available online, on steam, and as it works in Java

Screeps (https://screeps.com/ https://screeps.com/) is an amazingly great example of this sort of game. It's available online, on steam, and as it works in JavaScript you can use almost any language due to the huge variety of transpilers. It has numerous constraints that make the game more interesting including CPU and memory limits.