Disclaimer: I do NOT own any of these assets. All of them are licensed under a license similar to CC0 (as of writing this at least). If you want to use any of these assets yourself, follow the link to the corresponding asset and download it from there.
Any assets that are in the game and not listed here are made by me (@PraxTube, unless I have forgotten to list them here, it wasn't on purpose!) and follow the same license as the the rest of the project.
https://cainos.itch.io/pixel-art-top-down-basic
https://cazwolf.itch.io/caz-pixel-free
https://greenpixels.itch.io/pixel-art-assets-5
https://free-game-assets.itch.io/free-field-enemies-pixel-art-for-tower-defense
NOTE: Only the slime was used. It was modified slightly.
https://chierit.itch.io/boss-demon-slime
https://stealthix.itch.io/animated-fires
https://sanctumpixel.itch.io/lightning-lines-pixel-art-effect https://pimen.itch.io/thunder-spell-effect-01 https://pimen.itch.io/thunder-spell-effect-02
https://ansimuz.itch.io/warped-shooting-fx
https://creativekind.itch.io/necromancer-free
https://pimen.itch.io/wind-spell-effect
https://pimen.itch.io/earth-spell-effect-2
https://pimen.itch.io/fire-spell-effect-02
https://pimen.itch.io/smoke-vfx-1
https://elthen.itch.io/2d-pixel-art-portal-sprites
https://fliflifly.itch.io/hearts-and-health-bar
https://cazwolf.itch.io/caz-pixel-free
https://paperhatlizard.itch.io/cryos-mini-gui
https://clockworkraven.itch.io/rpg-icon-pack-400-skills-and-spells-clockwork-raven-studios Note: I do NOT own these assets, if you want to use them follow the link and get them from there.
Placeholder Icon: https://cazwolf.itch.io/caz-pixel-free
https://dryoma.itch.io/footsteps-sounds
https://shononoki.itch.io/rpg-music-pack-svl