Nice small game. This game would benefit from different aspect ratio, the best would be 1:1. Because sometimes an obstacle would show in the botom of the screen and there was only small time to react, but then another obstacle would show in horizontal axe and I had a lot time to react. But I like the connecting obstacles together to create a shield against another obstacles.
First I thought there should be some way of rotating in the other direction, but that would make the game much easier and not as challenging. So good job, for leaving it that way.