Does Donenfeld vouch for Tunsafe? I'd be reluctant to use a WireGuard client he didn't endorse, if only because I've been on the sidelines in conversations about VPN client software vulnerabilities and I know he's careful about this stuff (Donenfeld's background is in vuln research). There is more to get right than just the protocol.
I don't think he does, Tunsafe implements Wireguard, but it hasn't been updated for maybe 2 years now. Still, the UI is so much nicer than the Wireguard one