Has anyone tried to play this over PS4 Share Play? If so, how is the lag? Is it playable or should I not even bother? Thanks in advance for any info you may have.

I tried it and was pretty surprised at how lag free it was. However, the other person I was connecting with lives very close to me, so take that with a grain of salt I guess. Lag was never an issue for us.

Don't know about Nidhogg, but I've played Towerfall with Shareplay and I definitely felt some minor delay. After a while you get used to it and you'll be fine, though.

Thanks a lot for the replies guys! Think I'll pick it up and give it a shot.