pona mute mute a! this is genuinely an excellently made puzzle game!
By far my biggest issue is the lack of an undo button. With a puzzle game like this where you can easily softlock yourself, there needs to be a quick way to either undo a move or reset the level. Doing a hard reset and going through the level select every time is frustrating and discourages experimenting with the mechanics (the final level in particular feels unfairly difficult without being able to undo, and was the only level I was unable to complete). The Z button seems to be unused so I think it would be perfect.
I also think some level titles feel a little too spoilery. There were a few levels where I felt like the title gave away the solution too much, and spoiled a puzzle that I would have otherwise had fun trying to figure out on my own (>!leko li lon leko!< in particular felt this way to me).
Besides these two things, this is a REALLY well made game and I had a lot of fun! The puzzles are excellently put together, the mechanics are introduced and developed at a good pace, and I loved figuring out the little things that the bird and mouse can do differently from each other and using that knowledge to solve puzzles. I also love the music and the visuals!