Jam host here - do you have permission to use that song (Illusion)?
Viewing post in Touhou : Monochrome reflections jam comments
It's from the game engine i used
On the game page it says "no royalties aside from what you paid for the ost" , i assumed it was fine as other games used it
It's number 16 from here : https://store.steampowered.com/app/2561350/Shooting_Game_Builder_Soundtrack/