This is nicely polished. Controls are sometimes a little strange. Towards the end of the game when shift becomes useful, Sticky Keys on Windows can be a nuisance, mainly because there were sections I was holding shift for a lot of platforming.
The jump up to grab the ledge/platform mechanic was something I apparently missed the tutorial hint on as I spent quite a lot of time backtracking, not realizing there was one section where I could actually access by grabbing the platform above (that's where it leads you back to the entrance).
The one moving platform section where you encounter the "poison" room was a little confusing/frustrating. I thought I must have missed a power up until after way to long realized I could barely drop down into the room below.
Overall, very enjoyable!
Wondering if this section (upper left passage) is actually accessible, and if so, from where? I picked a powerup from that room. Can't remember which one.