Interesting game! I like it, but I think there's one problem holding it back: there's no feedback (that I noticed) if you mistime your inputs. Even though I know it isn't the case, it often feels like the game just isn't acknowledging my input, instead of me just having messed it up. Adding something like camera shake and an audio cue every time the player pressed a button at the wrong time would make the game feel way more responsive, and less frustrating too.
I'd also add additional feedback for other things, like when input *is* allowed. Maybe changing the color of the bottom middle reticle, and scaling it up a bit when a dot is inside of it? Stuff like that can go a really long way into making a game feel good to handle.
Other than that, the visuals are nice and interesting. The music is pretty solid too, especially for 48 hours. Good stuff :)