This game has a ton of potential! I love the idea of getting a limited to to go find enemies to kill and then upgrading based on that. I think either the timer needs to be increased or you need to increase the spawn rate or spawn them closer to the player. The map felt very bare.
I love the art style tho, that was definitely the highlight. I loved the animation on the enemies and the :) background. Seriously, great vibe
Good work!