Love the art! Very cute. The Touhou fan in me is saddened by the fact that we can't move up or down, but that's a personal taste thing.
I personally would've preferred another control scheme, arrow keys + Z for example. Pressing space bar fast multiple times is just not a motion I'm too used to. I think I also would like having charge attack relegated to another button and allowing the player to hold the shoot button to rapid fire. Maybe have the automatic fire be slower than holding to still incentivize button mashing?
This game would also work perfectly as a web build if possible. It's sad to see so many great games not get the rates and attention they deserve because of the extra barrier of having to download.
Thank you for the game, I loved it!