Points for originality
I hate mouse maze games. The Portal sees tons of them every day, all of them horribly made MS Paint looking mazes with giant red dot endings.
You did something good, though. You managed to take the game and make it interesting. Nice work on the obstacles. You made a mouse maze game worth playing!
It is clear that you put effort into it. The overall presentation was good.
I think the game suffered from a lack of diversity of music. I didn't much like the song you chose, and it would have been nice to see (hear) a few more songs. Glad you chose from the AP, though :)
As well as more songs, I think you would have benefited from some way to mute the music (or go between tracks if you had had more than one).
You should have a button to go back to the main menu from the 'Level Passwords' screen.
One thing I would have liked as well (because I feel it would have added to the presentation) would be if you had created your own cursor rather than keeping it the default. It could be something simple; just a little something to keep the presentation consistent and maybe give a better idea about the mouse's boundaries (though I know it's all about the point of the mouse).
Nice job!