I liked the narrative around the game a lot. I thought that it did a good job showing that a good narrative can pull together elements that normally wouldn't go together (spiders building robots).
I felt the player was a little too slow. When I think of spiders, skittery comes to mind.
Two things that I think would take this game to the next level would be some kind of progression/powerup system (different weapons, armor, something like that) or some variation in the enemies. Maybe have some that can shoot back, or that jump, or run sideways for a bit.
Great job!