Chiptune artist here willing to collaborate with you for GBJAM 5! Check out my SoundCloud here: https://soundcloud.com/ccolongames.
I have been making music every week for a while now, and at the same time I've been making Chiptunes for a twin stick shooter, called Mutant Chicken (coming to Steam soon). There's only about 3 pieces of Chiptune on my SoundCloud, but there are several others that have come out of Mutant Chicken's soundtrack.
Here are a few previews of the game's Chiptune Soundtrack: Audacious, Hazardous, The Cyborg, and the Mutant Chicken Theme.
If you are interested in working with me, you can contact me via twitter: @ccolongames, or via email: ccolongames@gmail.com. Please contact me soon as we only have a couple days left till GBJAM is over!
Hope to hear from you!
c: Games