Very interesting. Tried all the different input methods. I actually think combining keyboard + gamepad or mouse + gamepad is a very underutilized control scheme. I can imagine using a joystick to control a character and a mouse to aim, for example, could be a great way to control the right game. My issue with this game, however, is that the circles moved very fast and were very difficult to read while in motion. Realistically, you have until the time they stop until the time they fire at you to press the key, which isn't much time. Reducing the number of keys to just the home row or at least removing the number keys would make the game feel nicer to play in my opinion. If you get a number then you get thrown off your rhythm and will often get hit by 3 in a row trying to just hit the one key. Other than that, the idea is solid and could be really fun with some tweaks. Nice job overall, thanks for making it!