Excellent
Fantastic game. Nothing is spared from excellence; the visuals, the sound, the controls. Yes, even though jumping is all you do, you nailed the controls, because you can use either X, C or Space. This allows me to feel free to scratch any part of my anatomy when it has an itch, and not have to worry about falling to my doom. That's speptabularistic!
Oh, and I personally think this is NOT a plotless game. Yeah yeah, you could've had a truckload of cutscenes and backstory or whatever, explaining what was going on, who you are, and what you're doing. But that would ruin its subtlety, which is a no no for me.