I am still playing this game and bought it at launch, this is the beauty of a great game. You always come back for more
The difference in tower type is a big problem however, some towers I refuse to use because they are not useful or very economically viable. In this sense I feel that the game needs somewhat of an overhaul on its tower variety. Perhaps this will come in Monsters II or an expansion. (Disclaimer….sadly this is not seen in Encore to a great extent)
I am still playing this game and I bought it 6 months ago, which is the beauty of a great game. You always come back for more.