The way everything bounces and rotates, it's rare to see a game on here with such a strong sense of feel to it. Combines well with the sound effects as well. I think entering a door felt quite jarring and the level fades...didn't fade at all which felt strange given how polished everything else was but overall it's a really strong feeling game.
Mechanically, I like the core mechanic, having the player be able to create platforms is nice for creating those suspended danger periods, but there's not much to say beyond that. Mechanically it got very dull after a while given it's simplicity and not adding any new mechanics except the switches. I'm not really sure the switches added anything either, since they only exist in safe spaces, they don't really change up the gameplay in any way besides giving the illusion of non-linearity, when in truth it's still going from point a to b to c ect. Plus there not so intuitive when I have to hit each individual one to find out what it does, though I suppose since there more of a non-presence this isn't really an issue.
Also not sure about the game being a "speed running puzzle platformer". Nothing about the game seems particularly suited for speedrunning; the controls feel kinda floaty and the mechanics are so simple there's little room for innovation. There's not enough variance to the core mechanic that I could see any speed run strategy really forming.
All in all it's 5am, i'm tired and as a result probably being overly critical. Its got a nice core mechanic with strong polish throughout, I just felt it was spread very thing with little to keep me engaged. It's like the stages felt like filler to connect the interesting parts but those parts didn't exist. For no story of any sort, no new platforming mechanics and no music it's quite surprising that it lasts for 23 stages. But still, it's good.