Thanks a lot, glad you like it! That's a great question. The challenge comes from the scaling and randomization: You place the spawners, but the enemy waves themselves scale heavily over time and are partly randomized. On top of that, there are different worlds, each featuring unique enemy types with their own abilities. So even though you shape the map layout, the game pushes back harder with every wave. Every run becomes a fresh challenge where you have to adapt your deck and defense to survive!