It's a start. But there are some glaring issues. Your hitbox is ridiculously large making some of the patterns impossible to dodge, and the slow firing speed and slow bullet speed make it very difficult to hit anything.
I do like the idea of a shmup where you have to carefully aim your shots (that's very uncommon in shmups) but if that's the case then the bullets should travel a lot faster so it's easier to hit stuff.