man i really like the concept, but i cant tell the enemeies apart from the walls :(
You should make all the enemies one color, the player another color, and make the walls at either end of the line the same color as the 'roof' and 'floor' of the line so it clearly the end.
also never really used the dash move, i kind of just took my lumps and tried to kill the enemies i was facing cos i found it hard to predict how far i would dash for, probably somthing i could get with practice but yeah