Currently free as it was originally made during a Game Jam, Terra Nil is a city-builder with a difference. It's not about building a huge city or getting a big population but rather you helping nature to recover.
That's definitely an unusual setting, reminding me somewhat of Surviving Mars: Green Planet only with pixel-art and a much smaller and focused setting. While it's somewhat a city-builder, it's also a strategy/puzzle hybrid game all in one too due to the way the levels are made requiring you to plan your steps to beat it.
A brilliant idea too and it does look fantastic! I've been keeping an eye on it and they recently put up an expanded version which has improved it dramatically.
A whole new tier of buildings is in giving it a bit more depth, there's 4 different biomes now, it's had an overhaul of the art, plenty of little quality of life features to make it easier to play, waterfalls were added and new music.
They're not entirely sure what they will be doing with it but this writer hopes they continue developing it, as it's just such a wonderful idea. Especially on-point with all the talk of climate change. Quite a good game for bite-sized sessions too, as levels don't take a particularly long time. However, it could be expanded in many ways with bigger maps and new mechanics that I can see so much potential here it's exciting.
You can try it free on itch.io right now with builds for Linux, macOS and Windows.