I like this game. It's very simple and the gameplay is satisfying. I was able to get quite far, but it has replay value because I did die and I believe if I had invested in farms earlier I would have done better. My experience was that, after I placed 2 basic guns on the 2nd and 3rd strips of grass, nothing even came close to my castle and I was able to build what I wanted. Then Round 15 arrived and everything just came off the chains. I would flatten the difficulty spike so that it gets harder a bit more gradually (as others have said,) and adding some variety & randomness to the SFX would also be nice.