RIP to the brave camera person that helped demonstrate the Space Shark's weapons.

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Not bad for a start, of course, there are always ways to improve for next time!

-Additional inbetweens for the knee guard would make it smoother during the walk cycle.

-While this Space Marine IS trying to be intimidating by holding the weapons out, the upper body is pretty stiff during this animation. Hold your arms to the side as stiff as you can while you walk, and you'll find that your arms will bobble a tiny bit as you walk. Adding some of this motion will help your character seem more alive.

-The Space Marine is still standing in darkness when he stops moving, so either his fade-in entrance from the darkness should be slower, or the darkness of the hallway needs to end sooner.

-Extra animations as the Space Marine winds up for the slash would also do some good for the overall effect.

-The rig you built for this character is detail heavy, so adding the subtle inbetweens of the slight turning during a walk is tricky. Taking a crack at it will always adds extra points for dedication and effort though, so maybe it's worth trying at some point if you continue to develop this animation rig further. :)

Keep up the good work!