Nice game. I liked the retro art direction and the sound design fit well with it. I liked the variety of powerups and the bouncing bullets too, made it nice and chaotic when you played progressed later in the game. I also liked that enemies could pick up the powerups, that added another cool level of depth.
For improvements, I'd agree with Kharibidus, an upgrade screen showing what upgrades you have/what they do would be good. I'd also suggest making the players bullets a different colour, as it can be hard to tell which bullets will damage you when they are bouncing around a lot. Finally, you could add a couple of quality of life basics ( e.g. Pause Button/Screen).
Good work. Keep it up!