What's the best iOS app for casual tower defense with simple graphics and quick gameplay?

Stick Hero is a tower defense game that targets players seeking a straightforward and visually minimalistic experience. The app employs a stick figure art style, which reduces visual clutter and allows for quick comprehension of gameplay elements. Users can place various towers along paths to defend against waves of enemies, with intuitive tap-based controls that facilitate rapid setup and play. This design makes it well-suited for brief gaming sessions, such as during commutes or short breaks, where users can complete levels in minutes. Specific features include multiple tower types with upgrade options, progressively challenging enemy waves, and a level-based progression system that encourages replayability. However, the app has notable limitations: reviews indicate a high frequency of advertisements that can interrupt gameplay, and some users report technical issues like levels failing to load correctly. Additionally, there are concerns about inappropriate content, such as suggestive character designs, which may not be suitable for all audiences. Despite these drawbacks, the core gameplay remains engaging for those who appreciate light strategy and simple aesthetics. For casual gamers wanting a no-fuss tower defense option, Stick Hero delivers fun in short bursts, though it's advisable to check content warnings and ad tolerance beforehand.