Some really solid ideas here. The concept of a block puzzle game being a sequencer is neat. Getting all of these elements working together in a week is impressive.
I do think the UI gets in the way a bit, especially when there are more objects on screen. The last level in particular is visually difficult to navigate. Maybe it would be clearer to have the arrows only at the spots where items are supposed to go and the objects instead would be the goal color or have that color as the object outline.
The angle also makes it difficult to parse all of the UI elements and whether or not you're going to push something toward the upper edge since the (really nice) hand-drawn artwork is flat and has no depth. With the 2D art style, top-down might be more effective for separating things out a bit more.
The cat and zombie sounds are funny and charming at first, but over time they are a bit too loud and grating. At a certain point it made me want to address them first in the puzzle no matter what, which may be the intention! It's a little bit of a shame because the loops are otherwise so lovely and cozy, especially the last one (I still have it playing while writing this). It would also be awesome for the restart of the sequencer to have a cleaner-sounding loop.
Love the title screen theme!