Fonts

Monogram by datagoblin
https://datagoblin.itch.io/monogram
License: Creative Commons Zero v1.0 Universal

RuneScape UF by Nathan P
https://www.dafont.com/runescape-uf.font
License: Public domain / GPL / OFL

Sound

bong_001.ogg from "Interface Sounds" by Kenney
confirmation_003.ogg from "Interface Sounds" by Kenney
https://www.kenney.nl/assets/interface-sounds
License: CC0 1.0 (http://creativecommons.org/publicdomain/zero/1.0/)

Tiles

Gameboy Cave Platformer Tileset by jaredchansen
https://jaredchansen.itch.io/gameboy-cave-platformer-tileset
License: CC0 1.0 (http://creativecommons.org/publicdomain/zero/1.0/)