I only had one issue. Unfortunately, it's a pretty big issue - you can't see your target beyond the first trump (in level 3 you can't even see the first Trump, so you're mostly shooting blind. If you can fix that, I think you're good to go - well done.
That is intended, before every shot the camera spans from the right side showing the whole level and the player must then estimate the strength and angle of the shot. If failed - can always try again. The levels get bigger and harder as you progress.
That said I am going to note down your feedback and if more people mention that as a possible issue I will definitely consider a change in design.