there's a lost of computation intensive effects indeed but it does make the game barely playable for lower end computers and also those are effects that enhance whats on your screen, not make it. its like condiment, you need a meal to go with it. dont get me wrong, i think you had correct level visuals but it would have better used finer details, geometry, normals or textures, which in the end would have costed as much if not less performance. its like a plate of pasta with the finest salt, yes, it does taste better than pasta without salt but it could also taste better for a more affordable price with regular tomato and cheese (not a cooking expert tho dont mind me ^^')
also invisible walls as a main mechanic isnt viable unless there's a hint. i nearly left the game at spawn because the entry toward the maze was a fake wall (and its especially more important for non pros games as players wont have faith in the dev that the game is playable)
beside that, nice distortion effect and voice acting. also i suspect the maze is randomly generated too?