I think this is a cute idea! I like the idea of cats working together to find treasure. The level design is solid and the puzzles are pretty straightforward.
I think you should indicate whether each gate needs to have its buttons held, or whether it stays open. This was unclear to me, so I think it would be a good idea to make the types of gates different colors or something like that.
I noticed that the pixel art looks pretty blurry. If this was made in Unity (and I think it was), this is probably due to the import settings you used. If you want crisper pixel art, make sure to set "Filter Mode" to Point and "Compression" to None. This will make the sprites look a lot clearer:
Nice job overall!