This is a fun concept! I found it pretty challenging, spent about a half hour and couldn't make it past level 8. Maybe some kind of time slowdown mechanic or the ability to control your speed while swinging (changing the physics so that players slow down more when tethered, but can then nudge themselves in either direction to build up speed) could help to make it less intimidating to approach? I think adding controller support would be really useful as well, since the joystick movement is relative to a center, which makes it a little easier to aim for this concept than trying to find where the mouse needs to be, especially on a fast swing.