Besiege and Gang Beasts are 30 and 33 per cent off on Steam, respectively
Besiege is an indie puzzle-physics-builder with a unique art-style and some humor thrown in for a good mix and you can grab it for £3.91 on Steam, at the time of writing.
Another indie, of the Double Fine variety, is up for grabs at a reduced price. Gang Beats is a living room brawler best enjoyed in friend vs. friend vs. soon-to-be-enemy local set up. Acquisition is possible for a little over £10 during this weekend.