Cool beans. One thing I'd say, though, is that for me at least, the boomerang could be faster and further-reaching, at the moment it feels a tiny bit slacky/sloppy/some other adjective beginning with "sl". One other thing I'd change is maybe add some penalty to detonating the bomb too close to yourself, so that you consider your environment before you throw. Maybe becoming dazed for a second, or making the screen completely white? One thing I really did like, though, is how it would get stuck on terrain when coming back, that was a nice touch.
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Really appreciate your feedback. I shall play around with the speeds and distances. I have recently tried to make it so that the player could hold the Z button to build up the distance but I failed to get it working how I wanted as it interfered with the jumping and caused delays and stuff so I might take another stab at it at some point. That's an excellent idea about standing too close to the bomb and completely agree that there should be some sort of penalty for it. Both ideas you came up with are great penalties, shall have to think about this. Thanks again.