This is a pixel art platforming metroidvania, with a play time of about one to two hours for all three realms (depending on how fast you find your way, your platforming skills, and how fast you beat the bosses).
So no originality points here, but that doesn't mean it's not a fun little game: the controls are smooth, there's a good variety of enemies, and it's fun trying to find your way through the maze, while getting upgrades.
Two warnings: there are no save games, so you must play through it in one sitting. Secondly: don't press escape: it doesn't pause the game, but just resets your progress...
So this game would be a lot better with save games and more content, but still it's a short enjoyable game.