I really like the idea of skill tree that unlocks with materials gathered from each runs. Game looks simple but pleasing. Love the adrenaline pumping music and the soundclips used for Mori!
For the boss fight, I feel that her attacks are too quick to react, and it amounts to just moving to and standing on each portal while tanking all the bullets (they don't do too much damage for you to get hit with) until her health whittles down. I think slowing her bullets down while increasing the bullet damage can make the boss fight a little more interesting.
Really solid entry, thanks for making this!