Nice entry! I enjoyed the simplicity of it and the ease of restarting. It reminded me of the Mode 7 games for SNES. The only critiques I have are that it was often difficult to tell if you'd cleared a diamond or not (after awhile I figured out the little lama flashed a bit, but it needed more clear feedback) and it was sometimes hard to tell when you were in a square or not especially when they were moving fast away from you. Also a few times when the next wave started I died immediately because the player wasn't centered on the next stream (though that wasn't such a big deal because restarting was so quick and you didn't lose progress).
Graphics were simple but effective and there was definitely something hypnotic about hitting diamond after diamond after diamond, good job!