I found this to be a very fun game. It took maybe three hours of playtime to beat it, with most of that time being for the final two levels (which were particularly tricky). However, I found that the "phasing through solids mechanic" was both underused and a bit janky, and the hitboxes were sometimes weird (e.g, if you hit a vertical wall, you could still jump up it), but the grappling hook mechanic made up for both of those in terms of amusement. I'd give this a 4/5 - great game.