I'll have to keep a look out for those then (I'm currently on 4/6 symbols and... well, I know a lot of places that the secret area isn't). EDIT: Is is a little thing that looks like a doll? Because if it is, I know where it is, but I have no idea how to get there...
It feels like Tikal should be able to drop down to hang on a ledge that he's already standing on. Are there any plans to implement something like this? EDIT: Likewise, being able to jump in different directions from the walls could be useful.
Also, another thing it would be nice to see on the pause screen would be the total number of collectibles (teeth, symbols, etc) that have been collected.