This is Simon Said, but with only one button.

When a node hits the white bar in the middle, you have to wait exactly one second before pressing the spacebar. Things get hectic when multiple nodes are in the center at once and you have to remember their rhythm.

Made for the List Jam, using kultisti's list:

• the entire game lasts for less than 30 seconds
• the game is one dimensional (well, all the necessary gameplay elements are)
• the game has only one sound effect (I mean there's ambience but he said it's okay)
• the visuals are monochromic
• you control the entire game with just one button (no mouse)

The art in the background is all my own artworks, some of which you can see here: https://postimg.cc/gallery/6ZCcsGp