Wow, this game is very impressive! I enjoyed pretty much everything I saw in the game so far. There is a good variety in enemy types and the guns, so even replaying after failing to reach the final level is fun (haven't reached the boss so far, but got to level four). Haven't got to try all of the guns yet either, but I will probably come back to beat the game later. Breakable cover is a pretty good feature too, as some enemies require a bit of kiting or use of temporary cover.
However, one thing I've noticed is that it was pretty hard to notice the armadillos at first, they seemed to pop up very randomly, and I didn't realise that they were there at first, because they're so dark and inconspicous, and I was also focusing on the enemies shooting me at the time. After noticing them first, I learned to look out for them, but I wish there was like a short spawn animation of them maybe digging themselves out of the earth before they start spinning, or even just a way to make them more noticeable so they don't blend in that much.
Overall, I feel that it is awesome that your team managed to make so many game features in a week, there is even voice acting! Keep it up!