Great game! It was very fun, 5 star on that :D
I love the arena desing, with a lot of wall to use as cover. The enemies are very cool and have a very well made AI pattern. The pixel art is also very cool and polished.
I found a little exploit, you can keep switching weapon and increase the fire rate, because there is no recover time (that reminds me some old arena shoters I used to play back in the days lol).