Background art for the surface is made by https://szadiart.itch.io/
I bought their asset pack, because it looks great, and it fits the game perfectly. Thank you! And good job!

The font in the game was made by Hewett Tsoi, it is called Alagard and is free to use if credited.
Thank you! The font is absolutely gorgeous, and makes such good use of all its pixels and is very readable.

The platforming controller is a modified version of Noah Erz "Ultimate Platformer Controller"
https://github.com/Noah-Erz/Ultimate-Platformer-Controller-2D