Very polished and seemingly very well balanced in terms of challenge.
This is quite an impressive entry, the ship designs are really nice, and the bullet patterns while complex really seamed understandable to navigate, not to mention the frequently changing colors of the bullets even for enemies who shoot the same patterns offers some nice visual variety.
One detail i really apreciated was the seamless gameplay where the menus are just items to shoot with the ship to select an option, this made for a nice pause in between levels without interupting player control.
Lastly the music is amazing ! I really liked the level tunes, they fit perfectly with the action going on and really add a lot to the experience.
Now level 3 was quite a difficulty spike but i managed to pull through and complete all levels and i had a great time.
Congrats you did a great job especially doing all this solo :)