Like those games, it allows you to construct your theme park from an isometric viewpoint. However, it differs in its focus on logistics as well as park construction. You need to make sure the trash is cleared away and your shops are stocked, all while making the park look attractive to your visitors.
Parkitect is still very much a work-in-progress (the graphics certainly will be getting some attention) but you can play the pre-alpha version now. It’s currently available for Windows and Mac – a Linux version is slated for release soon.