I beat the story mode! Love the bait at the end. The minor enemies also have interesting expression. While not impossible, the enemies' bullets are challenging enough to keep the game interesting. The intro cutscene and ending are also beautifully done. The BGMs are also great and fit within the game.
That being said, I encounter a few issue (and maybe a bug) in this game. First, it is hard to find the player's hitbox. Second, please put the bullet in front of the character instead so it easier to maneuver in the narrow gap between bullets. And the last one, when I tried moving with the arrow keys, the character only move one pixel for each press. Dunno if the last problem is on my end tho.
While not affecting my gameplay in the story mode, all those issues are making the extreme mode harder than it should be.
Anyway, this is a good game! Good job with that!