Background Audio:

"Thinking Time" by Music_For_Videos is licensed under Pixabay's Content license

Incorrect Audio:

"Incorrect Buzzer" by Producing_RayLite is licensed under CC0 1.0 Universal

Correct Audio:

"Correct Answer / That's Right!" by Beetlemuse is licensed under CC0 1.0 Universal

Pick Up Gem Audio:

" Item SFX" by Davidw is licensed under CC Attribution 4.0

Goblin Sprite:

"2D Pixel Art Goblin King Sprites" by Elthen, Used under CC Attribution-NonCommercial 4.0

Gem Sprites:

"Gems spritesheets" by gersonMarcelo, Used under Attribution

Platform Tile:

Pixel Art Asset Pack " by Anokolisa, Used under Attribution