Nitropia is an indie developed tower defense title, from Dawn Patrol Games and being published by Bulkypix, that will be coming to iOS soon. The game incorporates real-time strategy elements with a gradual progression of complexity as you play. Each level will add at least one new challenge to keep the game exciting.
You will be able to play both offense and defense, collect resources, and pit your 3 best characters against bosses in Survival Mode. For an interesting change of pace, you will also be able to destroy enemy bases in Base Battle Mode.
Nitropia will be a premium game, but the developers will be giving a bunch of levels away for free and letting users choose what level of content they would like to buy into - such as the full game or the full game + all the advanced towers. The price is set to begin at $1.99, which gives you the full game and 3 characters to play with. You will be able to use earned in-game currency to unlock bonus characters, upgrades and advanced attacks.
Nitropia has a tentative launch date October 30.