It's alright. A tight and simple map compensate for some difficult controls. The lack of coyote time in particular was a bit frustrating, and, in many of the rooms, would've transformed the game from a tough platformer into just a relaxed open world game, like Knytt. There were also oddities in some rooms which kind of built up a sense of secrecy but were just genuinely unintentional...
Like, it's possible to get back to that room with lantern blocks covering the right exit without holding the lantern, and you can't go through that gap. Or how the room to the left of the two trader penguins is totally possible without the pickaxe, I thought it was just an interesting puzzle - but it was impossible to get back and I had to restart. And how you couldn't walljump back up through some "tunnels" which was kind of confusing and surprising.
I finished in about 15 minutes, and a lot of that was spent wandering about the open world. Swapping out items is a fun idea but it required me to keep a pretty complete mental map (which wouldn't've been as difficult had there been a minimap.)
For all I had to say about it, I think it was a fine short game with appropriate depth and flavour, and definitely impressive for just 2 weeks.