I like how hard this game is. It appears like a "I'm gonna finish this in 5 minutes" thing and then it evolves into a "ok - next time I'll pass this obstacle and then I'll probably die again". I think this was exactly the intetion behind this game: It's like life is. It's not easy, but with every mistake we learn and next time we do a little better. And I think every aspect of the game has this: You need to master the controls (jump, then move horizontally), position your character right before jumps, memorize passages and dangerous objects, try to see clear even when the view is distorted... Other games usually challenge you on one or two of these, but this one here challenges you on every aspect - and I think it's on purpose.
I bet the Anomalocaris could've made the controls easier to use. Add checkpoints. Make it easier to navigate the levels. But the whole purpose of the game is to challenge you, make you learn, make you better and ultimately succeed.
I was able to complete it and I love the sequence at the end. It has so much room for interpretation, but I chose to interpret it as "I was able to beat the game and the boss [which doesn't mean killing the boss] and for this, the boss accepts/respects me and leaves me in peace. I'm left behind - stronger than I ever was before. It all was a test and I passed it - I didn't quit, I grid my teeth and went through it.".