Closure gets off to a bad start. The tutorial only tells you how to jump and pick up objects using the keyboard, so fails to tell players how to play with a controller. Regardless of your control method, you have to learn the game's core mechanics by trial and error.
Your surroundings mainly lay in darkness with only scarce light sources hinting the way through the level. The game is a puzzle-platformer based upon light. In the game's world, only things that you can see are tangible, with the darkness swallowing everything else. This mechanic takes a while to get used to because your mind is trying to think logically. If you know there's a wall in front of you, you will logically expect the wall to remain after removing the light source.
As you play through the game, there's various light sources and objects to take into account. Your aim is to get to the door, but sometimes the door is locked and requires a key, or requires several objects to be powered by light before the door will open. You have to utilise the light sources and the game's core mechanic to get yourself (and the key) to the door.
The most common object is an orb of light. You can carry one of these at a time, and by carrying it, you can always safely walk across the ground but will always be impeded by a wall. Sometimes, it is as simple as dropping your orb at a distance where the light won't reach the wall, then simply jumping through the darkness (provided there is an illuminated floor on the other side of the wall for you to land on).
Other sources of light include spotlights which can be spun in place, but not physically moved. Angling these to create large walkways, or reduce/remove hindrances creates interesting puzzles. Later on you find larger spotlights which require either a direct power-source or another spotlight to be shone on them.
A common object you also find within the levels are pedestals that the orbs can be placed in. Some of these light up an area elsewhere, or transport your orb to another location; either by teleportation, or by physically moving their on a set path. The moving light can act as a moving platform, or an elevator which carries you to higher ground.
I often found that I knew what the solution was, but applying it correctly was the tricky part. Sometimes you miss a jump because your light source was out by a few pixels, or a lapse in concentration means you move a light source and your key/box goes tumbling down into the abyss. Once you die, the level is instantly reset, or there's a dedicated button to do so if you find yourself in a state where you can't continue.
There are three main worlds that introduce different mechanics, so there's enough variety throughout the game and a change in thought process. Water sections can be tricky because light sources float but keys sink. As long as you see water you can swim freely, but blackness causes you to drop as normal. Some levels feature sections where you cannot drop any items, or are unable to drop light sources onto spikes without them smashing.
The monochrome, hand-drawn visuals create a great and creepy aesthetic. The eerie atmosphere is prevalent throughout the game, but there is no need to be scared; it's not a horror game, it's a puzzle game.
Closure is an interesting game that makes good use of its core idea. The introduction of new elements keeps things interesting and provides enough content to give you good value. If you like puzzle-platformer games, then Closure is definitely worth picking up.