You did a great job with the sense of scale-- the animations are slow and weighty in the vein of Pacific Rim. I would have loved more feedback on my hits, I wasn't really sure when I was hitting or missing-- some additional sfx, vfx, screenshake would go a long way. The way the health bar is displayed makes it hard to read if you've done damage as well. Nice job!
edit: btw I love the GM-ish mech design! It's very eyecatching in the thumbnail.