When I saw the concept I clicked instantly to play the game as I love both the rythm games like DDR and fast indie shooters like Hotline miami, but I found the game confusing at first.
After some time I understood how it works that I have to be on the certain spot on the screen when the arrow is falling like in DDR.
It was hard to get, as the arrows don't give back any information or feedback if i got them right or wrong. Same with enemies, as I shoot them, nothing happens at first and then they disappear. My monkey brain is thinking that nothing is happening to them :D
I'd love to see this polished with more feedback/information for my brain that it can enjoy and to actually force the player to keep the rythm - here I was sort of playing two games at the same time but none of them was super fun.
Nice entry!