Evil Tower - Idle Defense TD occupies a unique space in the mobile strategy landscape by blending traditional tower defense with idle progression systems. Developed by Aurecas Games, the title has cultivated a dedicated following through consistent updates and player-friendly design choices. Unlike many free-to-play titles that prioritize engagement metrics over enjoyment, this game demonstrates how to implement optional monetization without compromising core gameplay. The core loop involves ascending through increasingly challenging floors while deploying towers from three distinct factions: humans, goblins/dwarves, and elves. Strategic depth comes from tower combinations and power-up selections that appear every ten floors. Players manage resources to upgrade defenses while the idle system continues progression during offline periods. The resurrection mechanic using gems provides recovery options after defeat, though some players note the random tower selection can occasionally create unbalanced runs when new options don't synergize with existing defenses. In practical use, the game accommodates both active play sessions and casual checking. The ability to run other apps like YouTube in a small window while playing addresses common multitasking needs. Interface design remains clean despite the visual chaos of later floors, though the ad prompt after boss fights does interrupt gameplay flow. The permanent ad removal purchase at approximately $20 receives consistent praise for its fair pricing and comprehensive coverage, eliminating ads for coins, revives, and other bonuses. User feedback consistently highlights several trends. The development team receives accolades for responsive support and regular updates that refine balance and add content. Recent changes to spells and the introduction of dodge mechanics in stage 3 have been particularly well-received. Some veteran players express frustration with the mandatory ad prompts every ten floors during late-game climbs past floor 270, suggesting optional implementation would improve the experience. The randomness in tower selection presents both replay value and occasional frustration when offered options don't complement existing defenses. Overall, Evil Tower succeeds as a polished tower defense title that respects player investment. The fair ad implementation and meaningful permanent upgrades set it apart from more aggressive free-to-play models. While the late-game interruption issue and occasional unbalanced tower options present minor drawbacks, the consistent quality updates and engaging core gameplay make it easy to recommend to strategy enthusiasts seeking substantial mobile entertainment.