Hello, in addition to the entrants of this jam, some other Itch members also made games in BASIC. I found some examples. Perhaps you want to know more about their games:

QB64:
https://manstersoft.itch.io/

FreeBASIC:
https://cybermonkey.itch.io/bubblechain
https://cmcgames.itch.io/fb-shooter-force-2019

AppGameKit:
https://metamorpho-sg.itch.io/purple-virus

AOZ BASIC:
https://aozwithphil.itch.io/cybenet

PureBasic or SpiderBasic:
https://ricardo-sdl.itch.io/

BlitzMax NG:
https://wiitd.itch.io/brick-breaker