It's a light Anno clone + Dungeon Keeper + tower defense. I give it a lukewarm recommendation, if you enjoy the Anno games, but SteamWorld Build is not up to the Anno level of depth or polish. SteamWorld Build is more like something to hold you over if you've already played out Anno 1800, while you are eagerly awaiting the release of Anno 117.

Compared to Anno, you'll only have one city / "island", though you'll need to dig beneath the city in the Dungeon Keeper element to keep your city supplied with resources. While gathering resources in the underground, you'll be attacked by monsters and need to set up tower defenses. This aspect of the game is extremely simple compared to an in-depth tower defense game. Here, you'll only have three different towers to choose from, and the towers don't have any upgrades. Maybe that's fine, because you've got city building and underground excavation to worry about, but if you are expecting something comparable to Bloons TD 6, you'll be very disappointed in the simplicity.

A complete play-through of the first map took me about eleven hours to get to the victory condition of launching a rocket. I was reasonably entertained throughout. But I'm not finding myself particularly excited to follow-up with a second play-through on a different map just yet. So, a lukewarm recommendation it is.

super fun and great

It's a wonderful game!