Please don't listen to the review that says that the game won't start unless you accept the data collection, you can play the game without problems even if you decline the tracking. I don't know if they simply experienced a bug or if they are lying on purpose to diminish potential sales of the game on gog as most of us who buy in here hate any kind of drm, but as I said, it is optional.
The game is pretty good, don't get me wrong, but there are many moments in which the only reason why you lose is because of luck. Losing because a certain combination of attacks just so happens to land in such a way that is absolutely imposible to avoid them all feels like bullshit, especially when each of them requires to react in a different way (and in a game that is entirely built around memorizing attack patterns, punishing you for reacting instinctively to said attacks feels unfair and frustrating). Also, to whoever decided to make the platforms in certain bosses proceduraly generated, you suck.