Impressive indeed for the timeframe given, and it runs smooth in the browser! Is that GLES 2?
Aiming is wonky with keyboard, but my xbox controller worked well, just the right stick camera control is inversed to what is normal in games (point left to move camera left) so pretty close to a working controller support.
Finally, nice job with 3D animations, I was messing around with that and found it very complex, one could lose a week just with rigging and retargeting… very cool you managed to actually finish a minimal game. Did you use Mixamo or similar or made the animations yourself?