Really solid combat mechanics! Loved how the goblins kept running into the fight then back away, made them look far more intelligent than if they simply rushed in. Also really enjoyed the upgrade system, where you chose the reward you'll get at the end of the next level. Made it for an engaging system where I was always considering what would be helpful a couple of steps ahead.
I'm conflicted on the graphics a bit. I find the high contrast palette very striking and effective most of the time, but the game did get a bit noisy with the random bits of high-saturation reds splashed about the otherwise dark environment. But in general, the aesthetics really worked for the general vibe of the game.
I'm also going to echo the feedback from the other comment about working on the camera a bit. A bit more of a deadzone and some easing would go a great way in making it less disorienting when flipping around trying to fight enemies from both sides.
Overall, great work. Your team should be proud!