I have some mixed feelings here. I loved the graphics and music, and the suddenly appearing walls an interesting mechanic. The thing I didn't like was that you CAN go through some walls. When you have walls that become visible when you are close, that presents you with a problem you can solve with memorization. That's cool- you are using a skill to solve a task. When you can go through a wall... there is no skill you can apply to that. Now you just try to bump into every wall and see if you can go through.
I see a lot of potential here, but passable walls makes me feel like the game is cheating :)