Great job with this game! It was a lot of fun to play. This reminds of the time I tried to create a similar game a long time ago :D
The gameplay was great, there were a variety of enemies, pickups and even a boss fight! And even though these kinds of games can quickly become very chaotic and unclear, I think this was not the case here at all! The music was also a great fit for the game, and the sound effects gave a nice amount of feedback to the player. I really liked it!
Maybe a tiny point of feedback is that the enemies were pretty hard to hit. I think this is because they moved a lot faster than the bullets you were shooting, or maybe because the bullets were pretty small compared to the planes. This might not be a problem, but just something I noticed. Another small point is that sometimes the enemies planes would suddenly turn when they were at the end of the screen. This caught me off guard a few times and they suddenly flew into me, which felt a bit unfair.
Anyway, I think this was really well made and a great submission to the jam! Great job! ^_^