Dungeon Hunter 2, Galaxy on Fire 2 and N.O.V.A. without a doubt. They were developed just before microtransactions took off, rich storylines and superb gameplay, DH2 and Nova even supported multiplayer. Gameloft released a Nova remake some years ago but it's garbage and also pulled DH2 from the stores so people would buy into DH5 instead, it's sad. GoF2 is still available though and I highly recommend it. The two Addons for like 6 bucks each are 100% worth it.