I really like the concept. Swinging around is fun and I like the take on it putting emphasis on being precise. That being said, it is difficult to move the targeting arrow when trying to grapple. I tried both on the keyboard and on controller and it feels a little stiff and unruly. If you can nail a couple of swings one after another it feels very satisfying though. I also think the camera should follow along with the character a little more closely, it's really hard to judge the distance on jumps as it is right now. I think it would also be helpful to add an audio cue or particle effect when you can grapple just to make it clearer.
The character is very cute and there's a lot of potential in the swinging mechanic!