How did I not play this earlier? (Well I know the reason, it was because there is no browser playable version) I've played many a shmup made for game jams, and every time I have had lots to complain about. Not this time.
I don't know how you did it, but this is a proper bullet hell game. The hitboxes are good. Basic movement is good. Bullets stand out clearly against the background, as do the bosses. Your own shot pattern leaves room for high level play. Bullet patterns are made with care. There are 3 bosses in total, each with a standard amount of patterns, and each boss fits a theme. Again, the patterns are good.
Firing it up on maniac mode, you can tell this is actually a proper maniac mode. If I'd have to start with only 3 lives, I'd have trouble but I'd be motivated enough to learn the patterns, dodge the bullets, stream the streams, and beat maniac mode on one credit. As any well made shmup should motivate you to. Right now I got a game over to the final boss, but I will be back and hopefully clear it after rating more games. This is a good shmup. The story isn't the most impressive, but it's clear where the focus went.
For how polished this game is you deserve all the praise. the aesthetics are also incredibly good. If you win first place, you will have deserved it!