Your game made my graphics card coil whine when the game loaded. I didn’t understand how many upgrades I could choose (10), and the projectiles were a bit hard to parse visually.
Other than those two nitpicks, the upgrade system is cool and the game is super fun. If there was a full Touhou game out there with a customization system like your game, I'd probably be more into shmups.
Also, sukusuku ship.