Cool game! Fits the theme. I managed to finish the game and find all three keycards and story things. Personally, I like when platformers have a little more floaty jump since it makes it easier to move while jumping, but I just watched your stream and I guess you like less floaty movement, so I guess it's not anything you would like to change. I think a more floaty jump would have enhanced the platforming of the game though.
Anyways, very fun game and a big map to explore. I appreciate that all areas look different, so you can tell them apart, which makes it easier to find your way around the level.