no way you used a game engine like Unity or Unreal, 1 milion percent you programmed this game yourself, also what API did you use if so? OpenGL or DirectX or perhaps Vulkan?
Edit: also WTF
nice, what libraries did you use for collision, and also model importing? i have been experimenting with OpenGL and i also wanna make a game engine, and i looked up learnopengl.com for the model importing but for the love of me i can't link the goddamn ASSimp library to my project i always get some compiler errors
also is it like a game engine with an editor or no editor and its all code, and like you add some ImGUI GUI for debugging and then remove it later?
Checkout the github repo of the game: https://github.com/EngPeterAtef/Chicken_Invaders
you can find the answer for all your questions there.