It's a hard one to review for me. I loved the Demo and the dev was really cool about feedback and adding features into the final game.
Now that I played the full game, I can confirm that the first four or five levels, one of which was the demo, are entertaining and breezy and relaxing, they're really a joy. You get to traverse with the grapple, which gives you access to remote areas and let's be honest, zipping around is just really fun.

Unfortunately it feels like the game runs away from itself from that point on. The mechanics that were so fun are left behind (the grappling basically disappears) for a sort of floating camera first person platforming. you can't see where you are positioned exactly and you have to execute series of jumps that are increasingly difficult and precise and leaves you starting over if you fail.

I pushed on because I wanted to get to the end and I was hoping to find that sense of fun again but it was a struggle and I would have loved the last levels to be closer to the core of the game.

This being said, I recommend the game because it's well made. If you enjoy first person platforming, the grappling will add something cool to it. Just because it's not my thing doesn't mean it's not yours so try it out for yourself.