I completed it there now. The final boss itself wasn't all that bad, maybe got him on my 4th try. It's just everything else before that kept on killing me. The hardest part in the game for me was Chapter 13. Specifically those 2 scenarios where you have to fight enemies without a platform beneath you or the chase sequence with the saw.
I do hate those scenarios where you're knocked down and get up only to get hit by an enemy attack, I do need to get better at those but sometimes it can be rather cheap. Especially on those silhouette sections where you can't even see enemies off screen until it's too late and it's just hard in general to see where you are or if your attacks are even connecting.
That ending was pretty sudden
Don't know what this game will do to the franchise, I don't think it's been successful enough with reviewers or connected with a majority of gamers to warrant a sequel or the curiosity for another 3D game. But who knows, the fact that this game even exists is pretty surprising in the first instance. Despite those issues I said, I did enjoy it a lot. I feel compelled to go back and get better scores. I'm pretty excited to see my name up there on the leaderboards for some levels (think my highest is in the overall top 20 players in one level) and I think I'll go back and do better.
Here's something for you if you haven't already discovered it, there's a secret achievement in the game where you need to press and hold down on certain buttons on the chapter select screen:
360: LT + RT + LB + RB + Left Stick + Right Stick + Select + Start
PS3: L1 + L2 + R1 + R2 + Left Stick + Right Stick + Select + Start
Doing so unlocks the achievement, and the stage music redone to sound like an 8-bit game. Here's an example of Stage 1's music: