I loved this game. I really liked the mirror effect concept. Very intuitive use of the two button controls. You made the limitation your feature. The design and art also look very charming. The game was too short though but I guess that was just because of the time limitation. It's short. It took me less than five minutes to complete the whole game but it really made me feel like wanting more. I also loved the animations and the effects like when each level ends.
One negative point I have is that all the levels feel very similar. Some diversity could have been added to the levels. Maybe more kind of obstacles. Or like change the terrain or just make it night. Just so one could remember each level differently. Like my game has just five levels and the look of the first three levels is same but I added different kinds of obstacles in each level just to make the player feel like he's playing a new unique level. Otherwise there is a lack of sense of progress.
Also I don't think you have added a transition back from the 'The End' screen. The game just stuck there. Maybe you forgot to do that but you should take transition the scene back to the Title Screen after a few seconds or on pressing a button.
Overall, I really liked the game and would love to see this expanded upon.