Rooks Keep seems like it would be a good game, but the problem is that the multiplayer is completely dead, there are no servers for this game anymore, literally none, and in May the dedicated servers were shutdown.
The game has multiple modes to play, there are two chess modes, classic and combat chess, and then a range of arena modes, which really feel like they are intended to be played online.
from playing against bots (because i couldn't play with human players), the combat seemed enjoyable and it allows you to upgrade your character during a game with points you get from killing other players, you can buy upgrades such as increased damage and movespeed, and there are quite a few different things to choose from.
However the main reason i am not recommending this game is because bots will only keep you entertained for so long, and most of the reviews of this game were written a long time ago, so there was probably a decent playerbase at the time they were written, but a game like this without multiplayer servers is definately not worth the asking price, I don't think many people would buy something like CS:GO without multiplayer, and this game shouldn't be any different.
Don't buy this game unless you are ok with playing alone with bots, or there is a price drop.