Here's a great deal I always recommend whenever it comes up: the entire SteamWorld series is cheap on Steam right now as part of publisher Thunderful's big sale, meaning $31.11 can get you a whole lot of very different but visually unified games featuring steampunk robots.
The SteamWorld series feels a bit like the spinoff games to titans like Mario or Zelda – all unified by a similar cast and theme, but totally distinct in their genre and mechanics, and pretty much universally good if not great. It's an anthology guided by cute little robots, basically, and it's been some of my comfiest comfort food for years. Here's the full list of games in this discounted SteamWorld essentials bundle:
