Ngmoco's Eliminate has been building up buzz ever since it was announced, and now the first-person shooter is out on the App Store to try for yourself. As you can see above, it offers some relatively basic FPS gameplay when compared to shooters on other platforms (I've been having a lot of fun with Borderlands lately), but given that this is the iPhone we're talking about, this kind of twitch 3D gameplay is actually pretty impressive. You can play online over 3G or Wi-Fi, and as you play, you can earn credits and level up, which gives you access to more weapons and better gear. The game itself is free, but it's all based around a microtransaction system where you buy "energy" which allows you to earn those aforementioned resources. You get a certain amount of energy per day on your own, and if you use it up, you can't progress any further unless you get out the wallet or wait another day. And the game uses ngmoco's own Plus+ social interface to track leaderboards and accounts. Interesting plan, and we'll have to see if players vibe with it or not. Some have already voiced strong concerns about the in-game pay-to-play microtransaction system.
If that doesn't vibe with you, and you'd rather play some old-school (and old business model) FPS gameplay instead, id's Doom Classic also got released on the App Store last weekend. That game comes at a cost of $6.99, but then again, with old-school Doom, you know exactly what you're getting into. And you won't have to buy any extra energy to charge your BFG and slay any demons you happen to come across.