What intrigues you about Pixl.js since you want to go for WiFi anyway? - Only when you want the combination of BLE and WiFi, then it fits, otherwise I would go for an Espruino-Wifi. If it is the display, there are other display that can be combined with Espruino-Wifi. Using Pixle.js you need anyway additional power supply and that can support both, ESP8266 and Pixl.js.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
What intrigues you about Pixl.js since you want to go for WiFi anyway? - Only when you want the combination of BLE and WiFi, then it fits, otherwise I would go for an Espruino-Wifi. If it is the display, there are other display that can be combined with Espruino-Wifi. Using Pixle.js you need anyway additional power supply and that can support both, ESP8266 and Pixl.js.