The intended way to play "Design Notes For a Puzzle-Action Game" is to download the .zip file, which contains images. Look at the images in order.

Thanks Dattorz!
Theme was turning into a monster from sergio!
Have fun! Stay safe!

EDIT EDIT:
If you played the first version of the game, don't press [Y] press [space]. If you just downloaded the game, press [Y]

New Edit:
I changed the title so it fits in the space nicely.