I like the concept of seed combos and navigating bullet-hell segments, especially with the naturist angle - but in practice it felt like just a little too much. Not in terms of mechanics or visually, but both moving and adding seeds with the keyboard at the same time was a bit too much work for my hands - and necessary, given the pace - and even once I got the hang of it I wasn't really enjoying the physical activity of it. I'd recommend re-thinking the controls to keep immersion in the game and further from keyboard management.
That being said, conceptually I like it. I found myself thinking about using the root seeds to stop the enemies that kept moving around, I liked that trees showed up where I shot, the setting and general intention - there's some good stuff there!