If you've been feeling like Crash Bandicoot N, Sane Trilogy is a bit harder than the original games it remasters, you're not wrong. There are some subtle changes in the remastered game that require more precision, one of the more glaring changes is that you fall more quickly in the remake after letting go of X than in the original.
There must have been plenty of talk on the changes in Crash Bandicoot N. Sane Trilogy because Activision decided to make a post about it. Activision's Editorial Manager Kevin Kelly went over some of the changes in a blog post.
"An increased precision is now required in the first game, which makes the gameplay experience different. Particularly if you are a new player, you may want to start with the second and third games first, and then come back to try Crash Bandicoot after you've had more practice. For those of you who played the originals and acquired a fair amount of muscle memory, re-learning the handling in our game may present an additional challenge you weren't expecting. But we're sure you up to the task."
On the jumping changes, Kelly wrote:
"There are a few subtle differences in Crash Bandicoot. Chief among these being the fact that you fall more quickly upon release of the X button than you did in the original first game."
For the physics:
"Our game engine features a different collision system than the original game, and combined with the addition of physics, certain jumps require more precision than the originals."
Basically, you all need to 'git gud' with jumping.