Cool concept! I like the metroidvania aspects of the game where the player has to explore the world to get new equipment to help stop the swarm in time. The water gun also felt fun to use; I liked being able to use it for both shooting and platforming!
I think the main critique I have is that there are a lot of mechanics in this game, and you are told how to use nearly all of them at once. I think it would be effective to present the mechanics as they become relevant, so that it feels a bit less overwhelming.
Still, I love the originality in this entry. Way to go!