you make a good point in that it is a very active game, unlike Cookie Clicker or other similar titles.
This does not however change the fact that it is a game in which you incrementally improve your stats through repetitive actions, which to me makes it an incremental game.
I like Terraformental because, unlike other idle/incremental games, it has more input and story so there is actually something more to do than just watch the numbers go up.