Just tried it, it's fantastic. great concept!
Just a few things could be added here and there.
I would prefer if a lot of the game elements were made more distinct since in the time that I played it, I had trouble telling the stage from the timing hud on the crosshair due to it not having enough contrast. There's also nothing in the game that tells you the control scheme, so I would improve on that later on, maybe.
Other than that, I love this project