That was very difficult
I felt it was nice to see another defense game and it was overall pretty original. I did, however, feel that it was simply too freaking hard as there were tons of enemies that came right from the beginning! No strategy seems to make me last for more than a few minutes! At least the enemies were designed pretty well and it did have different stages to play. I am so glad you tried to include some sort of guide for this. I will probably become addicted to it simply because I always do that with defense games.