Fan of the series here...
The levels flow nicer and are more dynamic than the originals, the mechanics are also nicely updated (better air & ground control, zoomed out camera), although no walljump direction options like world 3.
The pencil is useless compared to fpa world 3, particularily how it interrupts the flow and can't even be used on the pencil boss. It detracts a bit from the game.
The trip and ground bounce "features" are pretty annoying when speedrunning because the game decides somewhat randomly whether it wants to interrupt your flow or not. Just have him land on his feet and cut the garbage.