This game, to me, was a masterpiece. The first few levels will have you still getting used to the controls, struggling a little to fight off the enemies, but once you get the basics down, it'll be a joyride for the first few levels. The game progressively gets harder, though. The higher you go, the harder it gets. Some of the encounters with even the normal enemies are seemingly difficult, and might take you multiple deaths to figure out. Maybe more. Some levels seemed like a cakewalk to me, while others took me tens of deaths to beat. It really forces you to implement all of the abilities you unlock if you want to make your life easier.
Really Terrifying! First game of this year that really scared me! Just finished playing this game, gotta say it was a blast the whole time. Never a dull moment, always kept me on my feet. Definitely recommend this game to someone curious about it. I'm happy that it's on GOG!