Blockchain games are evolving,today's blockchain games are just early pioneers and semi-fun games stand out from those no-fun ones. It will get better.
As far as ultiarena goes they will have quite a lot of competitors, probably most notable are chain games where they already do non-blockchain gaming for blockchain rewards. Bit different, similar enough. Also not big fan of burn & redistribution tokens. I think I will pass this one and check their CCG later. Thanks for letting me know about them though.