Very in-depth and well written feedback comment, I really appreciate it. That stage 3 enemy is not a bullet but rather an enemy by itself yes, it just looks way too much like enemy bullets which was a huge mistake I somehow missed (Probably because of the usual jam panic).
Stages have this timeline which activates and deactivates different enemy spawners which start sending you a set type of enemy in a random direction (With some limits of course), RNG is definitely a huge risk to take when it comes to games like these even if it makes things a bit quicker. Honestly since it turned out decent enough I might mix it in a bit with actual enemy placement in a future game, I'm thinking of new ways to program and make levels as I type this and it says a lot about how differently a person thinks during and after a jam.
The composer of the game is Caramel64, they haven't uploaded the track to Youtube yet but I'll reply to you here again once it's available to listen. In the meantime here's their page: https://tinathecyclops.itch.io
Once again, thank you for your comment, it was very interesting to read.