Cool game. I like the concept and it's pretty fun playing through it. It does get a little annoying having to do a correct sequence every time you want to pick someone up, though. Maybe the first time you get someone you could need to do three symbols, but the following times you get that person it would only take one.
Regardless, the visual style is very nice. The colours well together and the sprites are very detailed. The music and sound effects are also great and lend a charming atmosphere to the gae.