Hey, if you want to play the original Half-Life Alyx with mouse and keyboard, I've made a mod that allows exactly that!
You can download it from here: https://www.youtube.com/watch?v=uV4kIbvktQY
FAQ Video: https://www.youtube.com/watch?v=gKU-bgyN9DM
If you meant remake the entire game in UE4, now that's going to be really difficult, but I do appreciate that you liked this short game so much that you want the full game remade in UE4!