I had this same problem a while back. Are you using an official vita charger? If not, try every charging brick you have laying around your house, and leave it plugged in for several hours. The vita (ideally) wants a specific wattage/voltage. The most crappiest charger I had did the trick for...
While I really hope they release some N64 games, I don't trust them to start consistently releasing them just because they built an emulator. Remember the 3DS ambassador program? They built a whole GBA emulator for 3DS just to release 10 games to a select group of people.
Do I need to do this is I haven't gone online with CFW at any point? I made an emunand as soon as I got my switch and haven't touched my sysnand or connected to a Nintendo server since. Would I still benefit from this?
Sorry for the noobish question.
The advantage (for me anyway) is that you don't need to install them, or uninstall them in the event that you need to clear up space. For all intents and purposes, it's a "cartridge".
I'm excited to play it, but I'm also afraid to start a new game until I finish Ever Oasis. I have a bad habit of starting new games and forgetting where I was in previous games.