Good shit.
I saw this and peoples ideas are getting really close to something I have had in mind for a while but I had a few innovations that I think will set mine apart.
I have been considering platforms to build the project and ETH was the first pick due to the smart contract functionality for a DApp. The problem is we have seen what happened with CryptoKitties (recall you hopped on that as well when you did the giveaway) clogging the ETH network and I considering the rammifications of my choosing that network.
I basically will have collectibles with a XP system but think it will be best to create a hybrid decentralized / centralized approach depending on the nature of the game's computing tasks. For example, the tracking of XP grinding between player levels will be tracked through a centralized server infrastructure and, once the threshold is reached (new level reached), the information will be committed to the blockchain along with upgraded stats of said character. This will reduce the frequency of transactions and minimize overloading the network.
Anyways, I gave the Steem Monsters post a quick look and my happening to randomly receive 5 packs may be the impetus enough to get started.
niiiiice. Get involved!