This game has the same problem that many other idle games have in that while it starts off addicting it gets boring and tedious after a while. However I got to the point of boring and tedious here a lot quicker than I have with other idle games. I think the main reason for this is that everything moves far too slow. The time it takes to get to the better units isn't so bad but actually getting money from them takes a long time mainly because of the limited clicks. If this game allowed unlimited clicks things would go a lot faster. The hero's whip makes this better but you have to reset your game when you get 1 billion gold if you want that.
Another example of how this game is slow is the campaign. The reason this is slow is because actually fighting and winning these battles takes ages. Skeletons are the best unit to use I find as they are cheap so you can quickly hire a bunch of them and attack but it still takes a long time. Also I don't know if unit damage gets scaled up with the different minions but it dose not seem like it does. Skeletons pretty much the same damage as demons and there easier to produce so I don't see the point in fighting with anything but skeletons
The game does have good points such as the art which i good and the musics not too bad. I don't think this is the worst idle game ever by any standards but the above points make it impossible for me to give it more than 2.5/5.