Terra Nil
https://vfqd.itch.io/terra-nilTerra Nil is a reverse city builder about ecosystem reconstruction.
Turn a barren wasteland into an ecological paradise complete with different flora and fauna, then clean up after yourself to leave the environment pristine. This strategy game/city builder/puzzler subverts the conventional goal of the city builder genre. Terra Nil is about the restoration of a ravaged environment, where the lightest touch is best.
It's really good and get interestingly more complex and in depth during gameplay.
The first map is just the basics, you have a wastelands in which with a specific amount of credits you must generate an environment with a set amount of greenery thanks to the help of various machinery , you'll need to have them powered and you can create rivers to reach further wasteland.
Once you reach the set amount of greenery if you didn't run out of money before, you win the map and go back to the main menu, now you can select another map.
It starts the same, with a set amount of greenery to reach, but once you're done, the map does not complete, you unlock the 2nd phase : set up an ecosystem with a 2nd page of buildings becoming available.
After getting enough ecosystem done to fill the gauge, the map still does not complete : you just unlocked the 3rd phase : you need to build a weather system with a new page of building available.
You will also need to get rid of the machinery you previously had on the map, and make a rocket launching site , bring the material from the scrapped machines back to the rocket site with a ship system until you reach the requirement to actually launch your rocket.
No idea if there are further phases to unlock as i run myself out of money before i could understand better how it worked
It's a very good and original freebie , the map seems to be randomly generated too.