This is an interesting game. I have previously played with the idea of having a door maze but found it to be annoyingly difficult even when I knew all the paths. I think you have a nice take on the portal maze. But I would of liked if there was a method to which portal was the correct one. Making it more puzzle solving rather than being completely random. I failed enough times that each time the screen swiped, I eagerly awaited for the room number to appear. I think it would be a nice touch if the screen transition swiped down when going down a level. Telegraphing to the player which direction they were going. The audio was a bit loud for my taste, I always advocate for having an options screen to allow the player to set the audio to their desired level. I think the music loop is too short for the amount of time the average player will spend fumbling through the levels. The credits sequence at the ending is a nice touch.
Overall, great job. I enjoyed seeing a new approach to a door maze game.