There are several issues with the Dancing Lights cantrip. Some of these are bugs, others are rules and some are feedback, so I wasn't sure which topic to put it in! I'll list the issues I've found so far with Dancing Lights and add any more if I find them:
1. Dancing Lights cannot hover and therefore cannot move between platforms. If you cast Dancing Light on a platform with no way to path to another platform, it is stuck there. The tabletop rules state that the lights hover so this shouldn't be an issue for it.
2. Dancing Lights should technically create 4 separate lights. Currently, it creates one light with 4 animated lights inside the model. The tabletop rule state that there should be 4 individually controllable lights. This change reduces it's power by a bit. If it's too much trouble to have 4 controllable lights I would suggest buffing it to cast Bright Light as opposed to Dim Light in order to balance it. This would make it a shorter range, ranged Light cantrip which requires concentration which seems like a fair compromise between the two cantrips.
3. The spell description for Dancing Lights says something like, "Summons Dancing Lights" without ever stating the stats of the dancing lights. This should probably be added for those unfamiliar with the tabletop game.
4. UNCONFIRMED - Dancing Lights potentially acted as an ally for the purposes of Sneak Attack. I need to test this again but thought I'd leave it here in case anyway else has seen this.