I recently purchased an iPhone and I was curious what game has the best 5$ dollar value I can download.
I like all the games listed already (and have a particular softspot for Ravensword). But you have to buy Space Miner. It's the new high point of original iPhone gaming. Simply amazing.
Space miner is great. It offers at least a good 4 hours of gametime for a quick playthrough and is actually great fun!
Second that. Battle for Wesnoth has a great amount of playtime, and they keep updating it. Haven't tried Space Miner but I've only heard good things about it.
Ok, this is biased since I made the game... but... "The Creeps!" is $.99, and there are three level packs available for $.99 each. You get a metric TON of content and many hours of gameplay for less than $4. Check out the iTunes reviews, over 4000 ratings overall and the current version is still sitting at 5 stars. http://itunes.apple.com/us/app/the-creeps/id300670609?mt=8