Idle Mutation Tower Defense

Idle Mutation Tower Defense is an idle defense roguelite set in a biopunk fantasy world, where you protect a living fortress from relentless waves of monsters. Upgrades physically transform your tower: new abilities grow into 3D organs that appear on its body and directly affect combat. Develop offensive organs, defensive structures, and rare cores to create powerful mutation combinations. During each run, collect red crystals for temporary upgrades, blue crystals for research, and genetic material to unlock new mutations. Between attempts, improve core stats, develop active and passive abilities, and prepare your fortress for deadlier waves. Experiment with builds, change your playstyle, and watch your base evolve from a simple tower into a deadly living organism.