Absolutely nailed the vibes! Some really creative and fun bullet patterns and I like the general work with windows.
Some of the bullet patterns were a bit too tailored to just standing still for my taste, and the boss did feel a bit bullet spongy. I think making it easier to upgrade with grazing and adding some more effects and feedback when hitting the boss would go a long way towards this.
Also my computer did start slowing to a crawl at some point hah.