I liked a lot the "Tutorial line" level at the begining of each stage. It was really great! Good job on that concept!
I had the idea that maybe you can add a "Next Move anticipation". I mean that if you're moving and you press an arrow just before you colide with a wall it will go in the dirrection you desired! It will help a bit with the flow.
Late in game I was unable to understand where my character was quickly at the start of a level, maybe you can also add some feedback at the begining to point out where he is.
I also got softlock there: 
<3 Luv from GlitchyDust <3