So, here's my two cents.
The first blade seed should be found before you have the chance of finding the first enemy, as it being in the same level, can cause the very frustrating experience of not being able to defend against a very aggressive enemy.
I really like the idea of the water system, but I missed a water source to be able to recharge, as I found myself without water and faced with a possible jump that, even tho on a replay didn't lead to nothing, left me with the feeling that I had missplayed.
And well, thats that. There is a really good idea here, and I really enjoyed what I could do. If you wanted to upscale this idea, you have a fun concept and really fun mechanics.