While I've not found it anywhere else, someone had recommended to me No Limits Coaster. They claim that there are actually coaster designers using their app --I can certainly believe it. It's one of the best roller-coaster simulator's I have ever seen. Better than Roller Coaster Tycoon series in my opinion.

Definitely that one, and also Terminal Velocity where you can fly around outside as well as inside!

8-bit shovelware indie games. They give me headaches and make me dizzy and nauseous just seeing screenshots of them without even playing them. Even now I just puked up a chunky bit in my mouth even thinking about it.