For context it's being ages since I played a mech game. I'm talking MechWarrior 3 or 4 ago. I'm that old.
I had a blast playing the arcade mode. The movement and shooting is great. I also kind of cheesed it by going on top of building and shooting down the baddies with the railgun and lock-ons. Maybe add a flying enemy to give a challenge to cheeser like me. Also you went crazy on the easter eggs! There's so many!
For the negatives, the game ran well but had massive lag spikes in the story mode. Meanwhile it ran fine in arcade mode, so I don't know what was going on. Also let's say the story mode levels needs some love! Although the "o'reliable" level was nice. The sprint should consume energy too, because for now there's no draw back to sprinting everywhere.
One more thing, is the grenade launcher supposed to shoot where you aim? Because it didn't.
Overall I had fun, and I'm curious to see where you take this game!