This was fun to play and had an interesting idea. There was also quite a lot of variety of rooms and levels. My only issue was that it was hard to tell if I was making progress or not, as it seemed that each portal brought me to a random room with no notion of how close I was to escaping.
Otherwise, the game feels rather polished with a consistent art style and some nice music - I like how the music changes depending on whether or not there are enemies around. Great stuff overall!