The security issue you mentioned I think only affected when they handle access to the cameras. I think you can set up a VPN and then turn off remote access on the NVR, so it seems possible to avoid that issue.
That being said that's a lot of work for something they should have handled securely in the first place and doesn't give me much confidence about their security in general.
Slay the spire and FTL are my two go-to travel games. They don't use much battery and give hours of entertainment