This is a great game! The gameplay feels well polished and satisfying, the enemies are well tuned and have a good variety, plus the gameplay is balanced great! I love the extra bit of challenge added by combining your ammo and health bar, it makes you think before every shot in the early game. The enemies still feel like a threat while not forming too unbeatable of hoards, which feels great early game, and the sheer amount of upgrades you managed to put in game in just 4 days is impressive. I only wish that the hoards got bigger as you progressed through the game, maybe tie the amount spawned to your timer? It doesn't affect the enjoyment of the game, though, and is totally understandable considering the time restraint. Ultimately, I think this game is crazy fun, and I spent a lot of time playing it! Fantastic work :)