It took a while for me to understand at first that I could 1) shoot diagonally and 2) I needed to be shooting the round manhole(?) in the bottom right. I liked the textless, almost surreal atmosphere of the game so I understand why there might not be a tutorial, but something like perhaps an animation showing the character shooting diagonally or highlighting the manhole a bit would make things more immediately apparent. I also had some issues with the keybindings since Ctrl+A/S would lead to me saving the page in Chrome, pressing Shift a lot to shoot would bring up the Windows sticky keys, etc. I think perhaps it might have been better to just use WASD+Space for both characters and maybe click to swap between them, something like that, since I don't think there is any situation where you need to be controlling both of them at the same time.
Also, I played through a few levels but then abruptly got a black screen during a scene change, and I am not sure if that was the end of the game or if the game had crashed. I had a great time up to that point though, lots of cool ideas with an interesting aesthetic.
By the way, we played your game on our stream tonight!