Very cute!
I love the art style and the alien has an adorable design. I also think the idea is interesting, and the game does get progressively challenging as it goes on! I also am a fan of the music, very sneaky.
I do feel like it could do with some more variation, if you ever decide to update it. Having the locations of the items change, or the layout of the house change, and so on.
Also, in terms of accessibility, the change from keyboard navigation to mouse navigation on the menus can be a bit jarring?
In any case, I really liked it! I had fun a and played a few levels. The game loop was pretty tight! Congrats on yall's game!