Well I think most of the quality issues have been addressed previously, so I'll go into gameplay specific things.
Quality of controls/graphics + drm issues aside the game is fairly good, if a bit rough around the edges. It desperately needs a way to create custom levels to have sustained replayability though. Multiplayer could also help this game in that area, though that is not nearly as important as a level editor. The ability to send people to more than one totem at a time would also be nice.
Lastly, being able to zoom out a bit more would be great since the camera becomes very annoying around tall mountains.