Nice game! I really like conquering all the levels, and defeating the boss was surprisingly easy. The character faces are pretty silly XD.
The graphics were a bit off, though the gameplay definitely distracted from that. I like how you can 'personalize' your mech from the many options. It became a bit difficult to find the final 1 or 2 objectives at times, but I found them eventually.
For future reference, although the style digs of that retro style 3d gaming, more consistent and cleaner art would be helpful. I also think the music scratched my ears a liiiittle too much, but the style certainly fits.
Other than that, I think this game was quite fun. The shooting was satisfying, and the overall game was very mechy. Nice work.