My favorite game of all time, at the very least up there. A game with so much heart put into it, made by a salaryman over the course of five years. Of course the plot has some loose threads, and the difficulty curve is really intense, and the requirements of the true ending are obscure and all, but it somehow manages to overcome everything going against it. It has a really captivating plot, an incredible OST (if you're playing one of the newer versions I recommend you play with the Organya soundtrack), and really good open platformer gameplay.

Please play this game.

(EDIT: If you're unsure of what version to get, I recommend the original Freeware version. If you want more content, then the Switch version, while expensive, is definitely the most polished port, especially compared to the remastered PC port.)