Pretty cool game! The rusty aesthetic with splashes of green reminded me a lot of old FPS games (though in a third person perspective). I think little hints of plant life, for example around the green checkpoints and some other spots, could have helped offset the monotone coloring while reinforcing the "nature vs. rust" theme. The model and animation of the main character were cool (I really liked her civilian outfit), but her "nature" aspect wasn't immediately very obvious.
The level was a bit confusing at times due to many areas looking similar to each other, but the map definitely helped a lot. The music was very nice and eerie, especially the combat theme! Although I think the drums on the combat theme were a bit loud compared to the melody. Still, having a dynamic combat theme in the first place is a cool feature!
The movement was good enough for a simple 3D platformer, although attacks felt kinda awkward. It didn't seem like the hit sounds aligned with the animation, and the trail of the weapon seemed a lot bigger than the actual range of hitting enemies. Overall, fighting enemies unfortunately didn't feel very impactful or satisfying. Besides, having to transform every time you initiated combat, I do wish the transformation animation was a bit faster.
The enemies themselves looked cool, although the hitbox for the roach hurting you felt a bit big. The final boss being a mini-bullet hell was a neat finishing touch, though I do wish there was more of a warning before it initiates the huge omnidirectional attack. Still, very good job!