Music and sound effects by:

Fire Loop by Iwan 'qubodup' Gabovitch, licensed with CC-BY 3.0 https://opengameart.org/users/qubodup

bomb_explosion_8bit by Luke.RUSTLTD, licensed with CC0 https://opengameart.org/content/bombexplosion8bit

5 Chiptunes (Action) by SubspaceAudio, licensed with CC0 https://opengameart.org/content/5-chiptunes-action

63 Digital sound effects (lasers, phasers, space etc.) by Kenney, licensed with CC0 https://www.kenney.nl

Retro Monster Roar by greg300, licensed with CC0 https://opengameart.org/content/retro-monster-roar

Punch, slap, n' kick by CGEffex, licensed with CC-BY 3.0 https://freesound.org/people/CGEffex/sounds/98341/

8-Bit Sound Effects Library by Little Robot Sound Factory, licensed with CC-BY 3.0 https://www.littlerobotsoundfactory.com