Concentric is a short game in which you jump between different rings of a circle in order to bring energy from the outside to the core until it is fully charged. Traveling along the rings are things that can kill you, you'll respawn but it affects your time meaning you probably won't be able to achieve the max 3 stars per level.

I didn't really finish it because it doesn't become that interesting, if anything it just ends up being rather tedious. One thing I didn't really care for is that there's no quick restart button, or at least it isn't showed where the rest of the controls are. Instead, you have to go to the menu and press restart, which wouldn't be much of an issue if this wasn't a game where levels last only a few seconds. Also, I extremely dislike the phantom gimmick, it made the gameplay feel pretty annoying and unsatisfying as the levels went on.

Overall, not sure I would recommend this game, it needs more focus on variation and enjoyment and at the moment feels too much like a demo to be worth playing.