yeah...no
I get trying to bring back "nostalgic" hardness in games, I really do. but this isn't nostalgic hard. Don't get me wrong, I don't mind a challenge, but this is beyond insane. The crabs have such a small kill box that it's just better to avoid even trying when you can, the Porcupines or whatever they were were cute, but come on.
Then, in addition to all that, you throw in adds every 20 deaths. that's really unnecessary. and I mean REALLY unnecessary.
Maybe, MAYBE without the adds every 20 deaths, It'd be ok. but this one hit kills, tiny killboxes and no room for goofing on jumps, and oh, every 20 deaths pauses the game and makes you watch an add stuff makes the game basically unplayable.