Developers who wish to develop applications (games or others) utilizing the blockchain should rely on a mix of on-chain and off-chain application architecture with respect to their application stack, especially until the Ethereum network has resovled its scaling issues.
Off-Chain - Utilizing a traditional database or application layer for an application's heavy lifting. There is nothing wrong with utilizing a database for what it's meant to do, and helps to keep only components of an application that can truly benefit from being decentralized on-chain.
On-Chain - Relying on what blockchains are good at now, on-chain components of an application could very well just focus on payments, ownership of digital assets, game assets bought with cryptocurrency, and authorization/verification that you indeed bought x item to interact with smart contracts that are part of application.
Game settings, design algorithms (i.e the GeneScience or KittyAccessControl code in CryptoKitties), admin aspects, pricing models, should be done off-chain if utilizing something like OPEN.
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People critizes the CryptoKitties trend but, it really highlights how Ethereum network is build to handle products, beyond ICO tokens.
will OPenMoney batch there off chain transactions between developers and users together daily and send the key off chain details to Ethereum through to secure as a smart contract in the blockchain?
Yes, it's a blessing in the disguise. cryptokitties showed the true potential of the ETH network and also that it's not properly ready yet.