Wow! This looks pretty impressive
great work
I have a few suggestions though
personally I found the controls a bit difficult to use mainly in regards to aiming and using the ninja stars, since you aim your weapon with the mouse could F be replaced with one of the mouse buttons? I also feel jumping might work as a mouse button as well and the mid-air hop needn?t have a separate button when it?s basically a classic double jump.
In regards to the HUD I really liked the first one although I think it could be clearer that the ninja icon is his visibility (it is his visibility right?) maybe you could incorporate an eye symbol into the circle somehow as a watermark or background image.
Lastly some of the colours of the background elements could be tweaked a little to separate them from the foreground a little more.
Can?t wait to see more!