Whether it be meta tools or apps, or literal concepts like a mineral or a race, for example, a must for me is for the world to be built in a believable manner, and at the most simple, following some decent climate rules without much restraint.
my favourite would be drip plume ice worlds with hotspots that allow for rainforests in 80 Celsius steam zones, very exotic, the temperature regulated by these hotspots.
I rambled on too much…
Are the sugar gliders more like familiars/companions for the wizards or do they have their own society and stuff? Is dancing something sugar gliders are known for?
They have their own society… Now. All the wizards are dead. They’re living in a post-apocalyptic world being overrun by magic, carnivorous weeds (because the wizards aren’t around to get rid of them e.g. with fireballs).
The wizards made the kads (that’s their species name) dance automatically because it was both cute and a control measure: They gave the kads powerful magic and were worried that they could rebel some day. So if any ever misbehaved or rebelled they could just play music and… Deal with them while they were entranced.