Really nice game here in my opinion! I thought all of the art and visuals were great. Loved the upgrade menu and that the upgrades give you buffs and buffs to the enemies. I agree with the other comments that the enemies spawning and just lunging at you from offscreen feels not great. I think it's fine that the enemies spawn offscreen, but maybe add an arrow pointing in the direction of the swarm with a message like, "Incoming Swarm!". You could also potentially have the camera zoom out as an upgrade, or even simpler just reduce the enemy movement speed. Lots of potential ideas! Overall still a fun, well made game. Great work!