Thank you for your comment DoodleLor. Yes, I CHOSE these graphic assets from various artists on itch.io: Aamatniekss, LuizMelo, Nvros (i wiil check if i forget any artist ) and contributed to them for their splendid work. It is fair that I mention them and verify that the graphic work in this project ("the game prototype") is not mine, but its implementation is. All the work with the code is mine, as well as the levels design, sounds, GUI, music (my own compositions) and other sections.
Anyway, the youtube video it is just an example to illustrate the sounds of this pack.