OK so first off I can't be unbiased I love puzzles that are like this so umm... more please.
Love the squash and stretch for movement. My only issue is that some tiles are off centre a bit and you can go though them. Because they are so close in colour to the blocking tiles its hard to see where to go at times.
Maybe make them the same colour as the ball(player) or a just use a basic tile. Add a small bit of screen shake when you hit the walls even if its animated on the camera one for each possible direction of wall would be relay cool.
Please make more Love this type of maze puzzle.