Okay, let's start with some criticism then;
The Chess Set buff is a good step in the right direction, but it still does not hold a candle to several of the event sets, considering the space it takes up and the considerable costs of crafting it. It adds nothing special or unique, and not in any amounts that would convince me to construct it, when I can so easily gain buildings taking up the same space which improve the mana and/or seeds production much more easily.
Of course, there are options to make this building worth the crafting effort and its spacing.
- If you add several KP (4 per 24 hours total), that would make it far more convincing, since KP is the true endgame anyway.
- Alternatively, you could let it add a daily bonus to any event currency, whenever an event is on. Since we have been seeing LOTS of events, that would definitely be a solid reason to build it permanently.
- Give it a permanent cultural production bonus; say +10% permanently to your Sun-score
It's these kind of things that would make more people consider it.
As for the rest; QoL and bug fixes are always welcome!