KIDS is a artful, contemplative game that has you move (somewhat anonymously) within and around and against crowds. It is part visual puzzle and part rhetorical argument.
Sneaky Sasquatch is a simulation adventure game where the player takes on the role of the title character and is forced to sneak around, stealing things from park-goers and not getting caught by the park ranger.
There are several games in the Rusty Lake series (all about the same level of quality). The combination of macabre art and fun puzzles makes the game a fun, fast-moving mystery exploration.