Texture difference,
Is a key to player sight.
Apply it wisely.
(I had to get Kitoko to help me with syllables. Thanks!)
I can do more. But, I really think you should add differences in textures, and a way to make use of vertical movement. These stages so far are completely horizontal, and you could give more of a dimension to play by allowing higher heights. I feel if you gave more visual references to the player, they wouldn't feel so lost in an endless maze. And it would still be nice to break to a nice open area now and then. (Every now and then, at the least)
That last screenshot looks really, really, dark. I hope you'll have some form of lighting.