Trying to jump off the ramps is ultra finicky, let alone having the speed to get either the shake or the N that require using a ramp to get to. The other letters you can just get dismounted and the other food items are easy to reach by comparison. That and the grind rails are really... touchy? a small bit glitchy, esp the rails that go upward, as the grindrail under the A just has you sit at the apex of it without moving, and the two rails that lead to the K, if you grind on them just right, can give you millions of points as long as you keep grinding as the game keeps repeating the grinding motion over and over.
But aside from those this is a really good skateboard sim, and really fits the PS1 tone it was aiming for. Almost a shame you can't Pre-Fatten Mac on the character select screen to see what her cap weight is, but it's probably for the best.