The art style is interesting, and the portal mechanic is actually kind of unique. But the controls are counter-intuitive and inconsistent, the scant few hints that the "tutorial" provides are either incredibly poorly written or just flat out wrong, and once you get used to everything and start playing the game...it just isn't fun. You don't feel like you're going anywhere and the level design is terrible.
Also, not an assessment of the game, but the developer appears to be a bit of an asshole. Protip: Casually disregarding criticism and blaming your player base for your poor game is idiotic, and it means your game is never going to be any better.