Few things:
Is yours made with a synth? It sounds like a string sample. In any case:
Using a synth, start with saw wave. And then add low pass filter and bring the Cutoff down enough to make a little rounder, but not as bright. Your patch is brighter so the rounding will help a lot. Also, in the filter, increase the Res. This will make the sound narrower, a little more shaped.
Lastly, make it a mono patch, and turn up the portamento so that as you switch from note to note, they bend into each other. That being said, I think the very first bend is made with the pitch wheel.