Wasn't a huge fan of the story levels but blasting things in the arcade was fun.
Feels like you can't die if you know what you're doing though
I don't know how much I should nitpick since I don't know how much you plan to change but here are some random thoughts:
Repair + railgun seems very strong, you can heal while reloading shots. It is fun to do but it made me not use the other weapons. The homing missile was also fun to use, I love the lock-on sound. Sometimes it blows up in your face when you fire it close to wall and its hard to tell what happened and where the missile is getting fired from. The other weapons seemed underwhelming compared to those two so I did not use them much.
The game was stuttering when I first started it. Eventually it ran fine but it was annoying at first. I couldn't check the controls when I'm in a game, it only shows the movement controls.
The enemies seem much more dangerous from up close, they drain your health very fast when they are next to you but aren't as dangerous from range. I'm not a huge expert on mecha games but imo it should be the other way around with strong enemies with powerful ranged attacks (that you can dodge hopefully) and small enemies with weak melee attacks that are annoying or maybe disable parts of your mech. Also I'm pretty sure some of the enemy projectiles disappeared while they were travelling. And even if they didn't they were far too slow to hit you.
I didn't really get what the items did. I assume one of them is a shield, no clue about the other two. It's probably explained somewhere but I feel like you should be able to figure it out yourself. Maybe there could be a voiceline or text message when you use one of them saying what exactly you are activating.
I like that there is an energy bar, having more things to manage is fun. I think it should also be drained by the sprint though and that way you can maybe make the sprint even faster? More mobility options is generally more fun