Besiegement: one more tower defence game [AppStore]

This is the second tower defence type game. The first one was called FieldRunners. This one is Besiegement. Nice graphics and exellent gameplay. Avaliable via AppStore for $3.99 (link).

Features:

• 30 levels, both storyline and challenges
• 8 towers, each with 6 upgrade levels
• 2 bonus abilities for tight situations
• Two modes of play, path based and maze building
• Achievement system with 18 goals to unlock
• Full sound and music, with adjustable levels
• Supports resuming play after exiting the application
• Online high score tracking
• 4 play speeds
• 5 profiles to keep track of your individual progress

Here is a video of this game: