For some reason, I’m not able to drag the bag… I’m on a MacOS using my mouse.
im on a macOS as well, I don't know what the problem could be.
be aware that you can't move the bags, by clicking and dragging you set the angle and force of the throw, also there are pink circles to help visualize that
Perhaps this game was designed for mobile?
well that's not something that affects your experience, but yes, you can also play it on mobile, but it shouldn't interfere with anything.
