I haven't played much of the original version so what I'm playing right now is all new to me. I can't really tell what's different this time, graphics look the same, controls feel the same, everything from what I played in the original is the same here.
One major criticism I have? I absurdly struggled with the second boss. At first I had thought I had to throw the knives in it's mouth when it opened, then I realized that I probably had to hit it from behind, which I was right, then for awhile I didn't realize I had to time when I moved so I had a chance of getting behind it in time to hit it. But the thing I struggled the most with? When you get hit, the enemies will respawn, this was absurdly difficult on the 4th and last hit before it would die. This wouldn't be so hard, if you could jump down from the platforms, like if you held the down button when you pressed jump, you'd jump down from the little platform. That would've saved me so much time and health points.
Overall while it's not that different from the original it's still very good.
P.S. I found a glitch where if you jump at a certain point right before the second boss, it causes it not to spawn, I think you might have already known because of the door you can go into.