Planetary Annihilation didn't manage to fulfil its Early Access potential when it launched early this year, but if you're in the market for an absolutely bonkers RTS, Bundle Stars are currently undercutting the Steam Exploration Sale thanks to their SUPERNOVA25 voucher code.
I've said it before and I'll say it again: there's a difference between a great deal and a great game. This is a great deal, but the game still feels unfinished. Planetary Annihilation was very promising in preview and is fantastic fun when you're wielding huge robot armies and smashing moons into each other, but the lack of tutorials, multiple factions and a more digestible UI can make this insane RTS an overwhelming and frustrating experience for newcomers. Still, if you like the idea of destroying other players with ridiculous mechanised rushes and planet smashers, we've never seen it cheaper than this. Thanks to oUkTuRkEyIII @ HUKD, who found this long before I did!