Creative grapple idea. I'd recommend making it clear that in order to shoot a thread the user has to click on a wall or floor. I kept trying to click in various directions and wasn't sure why my thread wasn't coming out. I'd also recommend zooming the camera out, as the player's options seem too limited with the close camera.
P.S. Might help to change the "Options" button in the menu to say "Controls"
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Thank you very much for your feedback ! Exactly, you can't shoot if a coin is in front of you. Indeed, the player must click on the white walls to be able to trigger the grapple. Okay ! I didn't think the camera could restrict the player. You are right and it can be interesting to work this camera. Yes you are right to think about changing this option button ! Thank you very much for all these feedback ! 😄