I really like the mechanics of this game. Swinging around and grappling to enemies, and shooting down picking away at the enemies vertices. Lovely retro visuals and audio, fitting well together, and great feedback. I do however find that it can get quite hectic, and it's very easy to lose control. I think perhaps the game could be zoomed out more, to show more of the environment and give more control to the player. Well done!
(PS, I do believe there is some resolution bug. Before scaling to full-screen the menu is offset and doesn't quite fit. After scaling it's still a bit offset. Not that it changes gameplay; it's probably something to do with your Unity canvas set-up.)