Not much, unfortunately.
This is what they said in their review:
Although RollerCoaster Tycoon 3D can be fun, its shortcoming prevent it from being the immersive experience the series is famous for. Fans might be excited to see the franchise return, but this portable simplification will leave most players feeling less than thrilled.
The final score was 5.5 / 10, and what stood out to me is that there is a “very small limit on the number of rides, coaster parts, scenery pieces, shops, and footpaths that can be added to the park”. I wasn’t rushing to pick up the game anyway, but it’s a shame they couldn’t make the most of what is an enjoyable franchise.