
1)
Kenney
https://www.kenney.nl/assets

2)
SketchyLogic
https://opengameart.org/content/nes-shooter-music-5-tracks-3-jingles

3)
Sinestesia
https://opengameart.org/content/ranks-coins-and-more

4)
VileR
https://int10h.org/oldschool-pc-fonts/