“Mellowtron” and “Jaunty Gumption” by Kevin MacLeod (incompetech.com). Licensed under Creative Commons Attribution 4.0. From Game Bundle 2: Retro. Edited to excerpts, faded, level-adjusted and compressed for this game.
CC0 sources: The Free Firearm Sound Library by Ben Jaszczak, Brian Nelson, Kevin Heras and Matthew Nanney; Kenney; Independent.nu; qubodup; AntumDeluge; Jarusca; MostyXS; C-V; dr19; ecfike; Villehardt. Clips have been trimmed, layered, looped, filtered and level-adjusted. The minigun uses PPSh samples from the firearm library with a playback ramp.