Its amazing how you used the rewind theme, but i have to say that i was overstraind from level 5, it was really hard, but your game just have 10 level so i think it was okay.
Maybe you would make level that looks more strange, exotic, i think you can do a lot with the lines.
Also art und music were very good.
I have to say it was a bit sad that Level 10 wasnt a real level, i wanted to see what the boss level looks like and then this.