I'm a little mixed on this one ha ha. The core idea of "shooting yourself" ends up feeling like a unique movement system rather than actually shooting yourself. That's not necessarily a problem, but it didn't really feel like what you were describing as much. The choice to make you slingshot yourself only when you stop moving ultimately kills the whole idea of "shooting yourself." Allowing players to slingshot rapidly as they moved would definitely sell the "shooting yourself" idea better. Additionally, minimalism is nice, but there still needs to be a lot of gameplay :)