I really liked this! A great take on the theme, and a very unique mechanic that actually also feels functional. You have some nice pixel visuals going and a sound track. You have several enemy types and several levels. So well done! With that said, I do have some small pointers.
I did not find that the light-effect did the game any favors. At the moment it serves no function of hiding anything (as the dark parts are not perfectly dark), so all it does it make everything darker and unclear, even more so as your color-pallet is rather boring with mostly browns and greys. I think it would have just been better to skip the light-effect all together and add some more color to the world, make it a bit more interesting! Make the important parts pop! Or if your going for a more "grim-dark" world the style itself must reflect that better and go FULL dark instead and make the designs a bit more serious (you main character for example, just looks a bit to "nice" for that).
The combat itself also felt a bit soft?/unclear? I think whats missing here is better visual and mechanical feedback that makes your hits feel more impactful! At the moment there is no knock-back or mini-stun/interrupt on any of your hits, making the enemies feel like they barely react to any of your attacks (other then that they die after a few hits), with-out this I am also force to play rather defensively as the enemies just keep going strait for me. A old Zelda game is a great example (like "Link to the past") on combat with attacks that are rather "simple", but with added hit-feedback makes it very tactical. Now, adding this would make combat easier as I can now knock them away, but that can be balanced with adding more health, speed or other stat to the enemies instead.
I cant be to harsh on this as you got some great feedback already: sound effects, some particles (even the swords of the goblins move!) etc. Love that! always makes the world feel more alive. Just don't forget the mechanical aspect of feed-back.
My last issue is that the worlds themselves are rather boring, do think about adding some environmental hazards in the future, add more props etc. to make it feel a bit more interesting! Its just all just very brown right now.
Lastly, a small bug. You could get stuck with the hook-shoot if you shoot at the edge of a corner:
Hope to see more! Great work.