So... I'll be starting my daily new impressions (not reviews) for iOS games mostly relating to anime and they're free to play (+ including some game apps or just some apps from the Japanese store too).
We're starting off with a free to play recent game that came out translated in English this month called Zombiegal created from a Chinese studio named Yanshu Sun. As the title named, it's of course about zombies.
As much as I can say, it's basically a typical zombie shooter with co-op play involved. The only downside I find in this game is that the items (including upgrades) are very expensive to buy with in-game money and possibly also with real cash. Although one of the few things to get items/upgrades faster, you'll just have to log in daily to get daily rewards which includes some in-game money.
Additionally, Yanshu Sun stated they will add more content. So it's kinda like in beta-ish. Since there's not much to say and to rap things up, Zombiegal is an interesting typical survival anime shooter.
Conclusion: Interesting shooter and is recommended.
Note: Currently not available in the Japanese App Store.