I loved it!
It reminded me so much of flash games of yore. I would totally spend an afternoon playing something like this with passion in my eyes.
The art style is great, really concise and consistent—I loved the little mouse 'cards' that appear when you select one of your mice.
It took me a minute to figure out how I would achieve the goal since I was so enthralled by how well everything worked and behaved. The fact that you guys locked the other areas and revealed them once you reach a higher level on your throne was a nice touch in helping the players out.
Hope you guys are really proud of your work!