All the movement mechanics are great. super tight and responsive. It's a really good fan game. I like the design of the boss, both mechanically and visually. The intro sets up the mood perfectly. Overall, the presentation is top notch.
I do think its extremely easy as you can just ignore all of the smaller mechs and go straight to the boss and end the game. Also it doesn't seem like there's a way to lose.
It's a really good foundation and would love to see it expanded upon. Great work!