Liked the look a lot, and it's impressive just how much content there was. Though in a way that's my one main downside, as it felt like it kept going for a couple more levels than it needed to, and the larger final level was too much for my brain to handle without a minimap or something. Perhaps some way of hinting which key goes to which door, idk.
One of my favourite little things was how the up and down doors were just rotated regular doors, which was actually very charming & cute!