Fun little platformer!
You made the music too?
Also since I'm into GBStudio recently. I wonder how you made bullets hit the walls. I guess some custom projectiles.c file modification?
In the past they’ve said the tag is an engagement hack. :)
I think it’s straight GBDK, at least according to gbtoolsid: https://bbbbbr.github.io/gbtoolsid_web/