Ever since I joined Glitch I've been trying to typify it, to understand and categorize and label it. Near as I can figure the closest label would be a Casual, Social, Online Metroidvania. There's lots of social elements, but the main gameplay consists of running around 2D platform levels with hidden areas.
I would like to encourage this and reccomend EVEN MORE HIDDEN AREAS! Especially areas that you can only get to by the creative use of items. Maybe something like a secret door on one of the roads that you can only reach by using Spinach to increase your jumping ability. I read that Keita Takahashi joined the Glitch team to add more surprises to the game. I hope this is the sort of thing he'll be working on!