After learning how to play the game I enjoyed the mirror idea. I would suggest putting a tutorial in the game for first-time user (the first time I played I went right into a block) and to not have the same block spawn twice in a row. A few times per game I can sit back as blocks pass by on the other side of the screen. Also I had a problem in 2 of my times playing that made it impossible to progress (screenshot posted below)
Overall, I had a fun and relaxing time playing this game. Once that gamebreaking problem is solved I could see this being a popular game in the google play store.
Good job!
