It's certainly an interesting chess variant, but some rules are unintuitive and downright absurd. Especially in Momentum Kingdom, I just wanted to smash everything. I had to move the king because of the Momentum piece's ‘future check,’ I couldn't help but think “What the heck am I supposed to do?”
After trying it a few more times, I finally grasped the concept of momentum pieces(and why it checks for 'future' places). But there's just too much to think about in this place. I'm never going back to this kingdom again :P
By the way, the game freezes with high probability as it progresses into the latter stages.