Initial scrolling of the Steam Summer Sale seems pretty lackluster, but digging through the comments sections in other threads, a few gems have stood out, and it doesn't appear we have a thread dedicated to this yet, so post what you think are the best deals here!
Not mandatory ofc, but it'd be helpful if...
One game per top level post, so comments stemming from it are focused on on just it.
Include a short blurb about the game - if it's one you've played before, what did you like about it? If you're diving in blind, what grabbed your attention?
Slick arcade-style twin-stick shooter with a pumpin' soundtrack. Clear out arenas full of robots, build up combos, and go for a high score. A large roster of characters offer a wide variety of playstyles. There's also 4-player local co-op.
Cactus is probably the single best mastery/arcade style twin-stick shooter out there. Don't let the cute looks fool you, while this game is solid to just enjoy, the chaining and level design offer great challenge if you want it, and the way each character changes both the basic play and the way you chain a level show a just fantastic design level.
It usually goes $5 in sales, but it's still crazy we can get games that good for so little.