I definitely like the new ending. That was a huge improvement.
I felt the last boss was too easy though. He can easily be defeated just by standing on the right side of the large top platform, ducking and autofiring. The few times he pops up high enough to hit you, just move a tick over to the right side of the platform again and repeat. No need to jump, dodge, etc.
Aside from that minor gripe, this was an amazing game. Event Horizon is one of my favorite movies and was obviously an inspiration for this game. Kudos all around.