Nice game! Qbasic is where I got my programming start, so this really intrigued me! I mostly made Kingdom of Kroz and ZZT wannabes, and only dabbled any sprite-based graphics. I eventually defected to art over programming, but my background in Basic helped a lot with using programs like DarkBasic Professional, and even engines like Construct (my current fav).
Anyhow, it was a fun space shooter! I found the enemies were super-tough, and it was quite hard overall. There seemed to be a random element to how soon the "boss" arrived. Sometimes I'd see the larger ships first, others times not at all. It seemed really hard to avoid the boss's attack. However, I did manage to beat it after 5-6 tries! I kept coming back, definitely enjoyable.
One other thing I'd like to see improved if you're continuing this project would be more feedback/satisfaction for destroying enemies. They just sort of disappear right now (i think?), it didn't feel as good as it probably should.
Really good overall though, and one of my favorites in the jam. I know it's a small jam, but really I did enjoy this one! Keep it up!