Split Dimension Gaming

As of writing this I'm on the final boss of the game For my first few hours of this game I wasn't having a bad time and it was semi enjoyable but after 3 to 4 hours in the stage hazards quickly start to feel unfair and excessive as do the boss mechanics you'll quickly find yourself dragging the next boss fight and the game becomes much more frustrating than enjoyable which is something I can't say for any of the genesis games call me biased but this design philosophy does not feel well done at all mania had beautiful design what happened here?