Nice start.
I would do few changes to the controls and how they are described.
I would describe it as:
- Hold and release to shoot (the longer you hold, the stronger the swing)
- Swipe controls direction
And second is that I would not make the strength of the swing reliant on the duration of the hold, but instead on the length of the swipe. With a deadzone in the middle, that has always the weakest strength, and a maximum radios beyond which it will be the strongest. This would allow more control over the swing and direction, as it would not be just swipe, but more like hold and drag.
But that's just my two cents. It can clash with what you intended for it.