Very impressed by the visual polish on this game! Also impressed by the implementation of the core enemy-swinging mechanic, I'd imagine it required some tricky programming. Everything felt nice and juicy with nice feedback for the player in all of the appropriate places.
A few notes:
When getting to the last enemy in an area, you just have to sit there and wait for them to die. Maybe you could implement a launching mechanic, where you are able to manually release the enemy after swinging them. Would feel really good to build up momentum in an enemy and then fling them back at their fellow gang members (or launch them off a cliff)!
Also felt like it would be nice to have more space to move around in the levels. Maybe it is an intentional design decision to make it more challenging to complete the levels, but it felt so good to just fling enemies around that I would have preferred if I could just focus on that.
More nitpicky:
I died 2 times in the tutorial, and it would have been nice if I could have skipped the dialogue for the rooms I had already been in.
Actually not sure if it is possible for WebGL, but you should hide the hardware mouse pointer so you can show off your nice targeting cursor! (If you are already doing that and it's just a WebGL thing, ignore this)
More of a mechanic idea than actual feedback: Could be cool to have some kind of life steal mechanic while you are attached to an enemy, making the mechanic dual purpose.
Overall a super polished game, great use of theme, and actually a lot of fun! Really good work.