Fortress Frontlines: Card TD

Fortress Frontlines: Card TD is a solo, intense tower defense game with a standard progression system and high replay value, but it suffers from frequent connection errors that can erase progress. Players will likely need to invest time and potentially money to overcome later challenges, and the game is not playable offline or easily interruptible. It's best suited for strategy fans who don't mind a demanding experience and potential frustration with its monetization and stability.