Cobalt—Mojang's Not-Minecraft platformy, shootery robot game—is currently free on Steam. However, it's only free on Steam for this weekend, so be sure to git downloadin' if you want to shoot other robots in slow motion.
There doesn't seem to be a Cobalt review on PC Gamer, but the Steam reviews are "very positive", and there's a 33% sale on at the moment if you'd like to keep the game forever after the free period. That free period ends at 9pm GMT on Sunday night, 1PM PST Sunday afternoon, or whenever that is in your local timezone.
These video introductions to Cobalt's various systems might be worth a watch.
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Tom loves exploring in games, whether it’s going the wrong way in a platformer or burgling an apartment in Deus Ex. His favourite game worlds—Stalker, Dark Souls, Thief—have an atmosphere you could wallop with a blackjack. He enjoys horror, adventure, puzzle games and RPGs, and played the Japanese version of Final Fantasy VIII with a translated script he printed off from the internet. Tom has been writing about free games for PC Gamer since 2012. If he were packing for a desert island, he’d take his giant Columbo boxset and a laptop stuffed with PuzzleScript games.