Maybe it's because I've been bouncing between a lot of weighty games lately, but I've found a great diversion in The True Slime King, a simple three button platformer that recently left early access.
Speaking pedantically, this isn't "as simple as it gets", but you'll get what I mean if I describe it that way anyway. You move and jump, dodging spikes and lasers and ISO 13370 compliant death pits, and ideally collecting all the hard to reach thingies along the way. These are far from my favourite genre, but I've played enough to realise I'm partial to a good one, and this is a great one.
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