I played this on my i5 8400 GTX 1060 rig and dear god. This may have graphical improvements but by and large still looks akin to a last-gen title, and of the sort that prioritize 60fps by reducing certain graphically slick features but this version brings out all the worst aspects of Unity's optimization.
I had to dial back several things from reflections, shadow distance and quality, etc. and it still chugs in a weird stuttery manner every so often.
The movement being changed to the Heroes type of acceleration movement doesn't work with 06's level design. It really just doesn't in my opinion. I had several deaths in Wave Ocean and Kindgom Valley, even as Silver, because I ran at higher than crawling speeds and tried to make a short jump which I couldn't because the camera insisted on looking over the platform I'm supposed to land on, and with the box-of-soap movement made it impossible to maneuver the landing. This was one thing that was a little problematic in 06 too -- I would turn in 360 degress around myself with the overly sensitive movement trying to land tricky jumps but at least I could maneuver it because the movement was more static.
The Gistix remake is 100 times better to me. He applied acceleration too but only on certain jumps, the skating but not the normal jumping. Physics is cool but the P-06 version is out of control.
Graphically while superior certain parts also look aesthetically inferior to even the original now. The color grading makes dark caves unintuitive for platforming so I turned that off. The VFX is overkill from the GPU-killer robot explosions to the "wow look what we can do" water-drop effect on the screen in Kingdom Valley, and there's just something about the saturation across the board, which looks great in Wave Ocean but makes Kingdom Valley lose its somewhat dank tone, especially the mach speed part, which actually looks more basic somehow. Kill your babies and look into some of the problems I mentioned, that's my advice to ChaosX and friends.
I really gave this a fair shake but after a while I just started to distaste it. I think the focus on such a remake should be better than this.
PS. Maybe I didn't make it clear but the Gistix version sports some of the same graphical improvements but has much better optimization. This needs to be fixed or anyone with rigs below GTX 1080 sorts of machinery will find this way more frustrating than it has to be.