It is surprisingly fun to stack blocks to block bullets. However, I wish the waves were a little bit harder, possibly coming in from multiple directions. I ended up working on building the tower during most of the waves, which does not seem like the gameplay experience that was intended. If bullets came from multiple directions, it might encourage a more conservative playstyle and make hiding in the tower much more heavily encouraged. The idea and execution are great, I simply think that harder waves would be an improvement, making it much harder to simply dodge the bullets.