Brilliant! This is an incredibly high quality and polished experience.
Let me start with the graphics which are super appealing. I especially like the intricately detailed and well designed main character, really gives the game a flamboyant vibe. I find the gadgets and weapon make him appear really cool. The low poly platforms and clutter fit the game's aesthetic perfectly and read very well when the player is moving through the sky at high speed. The UI is also of very high quality and well designed, which makes the feel like a commercial release. Please let me know how you achieved the cloud effect, are those just static meshes (voxels + marching cubes)? They really look great!
Jumping and swinging through the air with the grappling hook is a joy. The movement feels really smooth and the control is surprisingly precise even at high speeds. Though I do have a minor gripe with the unwanted momentum that comes with the slice attack, which often caused me to fall off of my platform, though this can of course be remedied with a well-timed grapple.
The music and sound effects complement the game very well, I especially like the pneumatic hiss when performing jumps. I was a bit surprised however that there is no real feedback when the character takes damage.
Of course, the most disappointing thing about this game is that it just ended after collecting the scrap, I would have happily gone on playing more levels for much longer!