I really liked the art and music. It gives a nice atmosphere!
It took me multiple tries to beat the game, but was happy to reach the top floor. It was abit frustrating at first because the controls/mechanics differ from most platformers and there are no checkpoints but it was fine. I think adding one or two checkpoints and making the character be able to move horizontally while jumping would make the game easier and more accessible, but I can see how that could maybe make the game too easy maybe.