Train Assault: Idle defense

This is a casual, solo idle tower defense game played in portrait mode with short sessions, making it highly interruptible and suitable for quick play. While it offers replayability through level progression and an idle system, some players find it has an 'early paywall' or requires watching ads to advance, suggesting a pay-to-win monetization model. It's best for players looking for a low-stress, mindless strategy experience that doesn't require constant attention.