The main attraction here is the beautiful art and the dreamy world. These are the best aspects of the game.
The gameplay / basic mechanics essentially boil down to:
1. Basic platforming (at which the game is mediocre and sometimes bad)
2. Throwable levitation pebbles.
The levitation pebbles are an item which you have an unlimited supply of. You throw them at a surface and it creates a sort of tractor beam rising up from the surface at which you threw it. If you throw it on the floor, you get a vertical beam that levitates you upward. But you can also throw it at walls to get a horizontal beam that carries you across gaps and so on. There are also diagonal/slanting surfaces, which allow you to create beams that elevate you in a diagonal direction. The pebbles can also be used to push enemies off of edges, lift them into spiky ceilings, and so on.
However, the game is extremely repetitive, the platforming feels mostly boring, the controls don't feel very tight, and the levitation beams are more difficult to use than you'd like them to be. What starts off as a relaxing stroll of a platformer through a beautiful world of child-like whimsy soon becomes death after death after death, as the game repeatedly punishes you for failing to demonstrate accuracy and precision using a very innacurate and imprecise toolset.
6/10 is a pretty fair rating, in my opinion. It's definitely not an awful game, and it's worth checking out just for the interesting art/atmosphere. But it's also not a particularly great game. Worth checking out if some of your favorite things are platformers, light puzzling, and constant repeated deaths. Otherwise, you may find the gameplay isn't as captivating as that wonderful art makes it look.
Overall: meh / 10