This was a pleasant, brief distraction. Ninja girl fighting through aliens. I can work with that.
The controls were a little iffy at times, but it wasn't a deal-breaker. One thing that got me irritated was that you seemed to be unable to run and throw at the same time. However the art was cool in a pixelated style. and the music was awesome. I DID like the callback to the old school Ninja Gaiden's invincible fire wheel.
Two issues I noticed:
One: There doesn't seem to be any point of purpose for the roll. Okay, it lets you move through enemies without taking damage, but now you have a hostile on your rear. its just as easy to melee your way past them.
Two: I noticed that in the moments between when you died, and the start of your next life you could still throw knives. It didn't seem to do much apart from reduce the number of knives I had, but it still seems to be a bit of a bug.
Bottom line: Not flawless, but there is definitely more good here than bad. Keep it up!