Hi, welcome! Joining this game jam will be an enjoyable experience.

Sometimes I can find interesting games written in BASIC on Itch. I list some of these interesting games here:

RCBasic:
https://joe7m.itch.io/galaxyranger

Blitz3D:
https://stevieg.itch.io/super-grouper

QB64:
https://manstersoft.itch.io/laser-looter

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

AppGameKit: 
https://lunar-wire.itch.io/birdwatch
https://geogames.itch.io/conquistadors

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

PureBasic:
https://ricardo-sdl.itch.io/one-button-tetris 
https://rvretrogames.itch.io/spaceinvaders

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