I've been playing this game for quite a while now, and it's really fun! I like the whole idea of stealing stuff from your enemies if you decided to buff them, which I don't think I've seen for quite a while. The gameplay is super smooth and satisfying, and the shooting feels really punchy. Music is nice, though the sfx crackling is annoying after a while. Overall, I liked this game quite a lot! Though I'll admit I can't get far into the game and died to the third mech over and over and over and over again.... not sure what I've done wrong, and I'll definitely come back for another run later.
For some criticism, I'd say the engaging distance is a bit too far away, and for most of the time, I am only seeing the arrow pointing towards the mech, not the mech itself. I tried to close in the distance but just couldn't really managed to do so. Also, the upgrading system is a bit unclear, and even though I didn't buff the weapons, I still got that crappy slow gun from the second mech (adding to my frustration). It would be nice to know at least what you've acquired from the enemies by buffing what. A text would do the trick nicely.
Anyway, this is a really well-made game and I like it a lot! Well done!