Yes, they just us an H-bridge. The LEDs are connected back to back, giving two channels. The standard colour combination is red & yellow, or green & blue, but warm and cold white, are also available,which look more like gold and silver.
I wouldn't bother trying to modify it. It's probably easier to buy a 30V PSU and build your own controller. It shouldn't be difficult: an LM317L for the ESP32 and an H-bridge for the LEDs. The only thing I'm not sure of is whether the LEDs have an external resistor, or if it's build-in to the PSU.