In the past few months, UndyingNephalim has shifted priorities back towards his Star Fox fangame project, it seems. Recently, we've gotten an in-universe start menu screen. It features a holographic projection of the Lylat system in the middle of the Great Fox's bridge while the various Star Fox team members do work in the background. All of this is accompanied by a chilled out groove based on Star Fox 64's menu music.
Next up, a recent video showcasing a much more polished heads up display UI for the gameplay. It shows with large bars and text what teammates are saying, health, item status, boost status, and more.
Finally, a video from last month, which shows off the mission briefing and weapons loadout screens, along with some ground mission footage.