This is really well made in both gameplay and visual presentation. Most of any criticism is going to be quibbles, so let's quibble real quick.
Since you have multiple control schemes, I'd put that somewhere at the start. I had to fumble around hitting keys until I found the one I wanted to use since I'm on a laptop and not using a mouse right now.
The bigger quibble is the game is a little imbalanced. The charge attack is so good at building stagger that it really overshadows the counter hit after you get it. It's always better and more effective to just jam charge hits all the time and not really use counters at all.
Otherwise, it's fun in all the ways a shooter should be and very creative in the ways that it works. Pretty good.