There is variable jump power, but you can only control it in a small radius around the player. This was mainly due to how difficult it was (and still is) to move toward the edge of the screen when you're already close to it. I think a better solution could have been to make power based on the proportional position of your mouse between your slime and the edge of the screen, instead of just how far it is from the slime, but I didn't think of that until after the deadline. Thank you for playing and leaving a comment! :)
Viewing post in Slime to the Sun jam comments
That makes sense. Another alternative is to capture the coordinates when the mouse is clicked, then do the power calculation based on the the mouse location at the end of the drag relative to the click position. In that scenario, it doesn't matter where you click, just what direction and how far you pulled back the shot.