Nice and simple, I think this mostly accomplishes what it set out to do.
I haven't played Fruit Ninja, so there's possibly some genre literacy I'm missing, but I found myself wishing that there was some differentiation between score being lost from my actions (clicking a red shape) vs my inaction (having a shape fall off the screen).
I managed to reach the target, and enjoyed being able to continue playing, but I was anticipating a touch more fanfare for achieving that.
I also felt like I'd enjoy seeing a timer during gameplay so that I could track how well I was doing via something other than the score, which is constantly changing and reflects immediate state rather than overall performance.
Hope you had a positive experience using Godot, and thanks for doing a Linux build!