i've always wanted games where you get rewarded with steem! :)
but any arcade/graphical/real-time games that run on the client will be hacked/cheated.
i made slotto because it's the easiest to build on top of the steem blockchain. i'll have more complex games later on. for now you just can't have something like pacman where you can ensure that nobody cheats because unless everything runs on the blockchain, you just can't verify everything.