Played some Gauntlet recently in a LAN party online. I've played before and even created a guide in PlayOnLinux, but now it runs beautifully in Steam with Proton. I was able to play an online game and invite friends who are using Windows. It ran perfectly! No bugs or graphical issues.
Proton handles it just fine!
https://store.steampowered.com/app/258970/Gauntlet_Slayer_Edition/
Specs:
Mint 19.3 64-bit
GeForce GTX 1060
Nvidia 430.50
Proton 5.0.6
Proton handles it just fine!
https://store.steampowered.com/app/258970/Gauntlet_Slayer_Edition/
Specs:
Mint 19.3 64-bit
GeForce GTX 1060
Nvidia 430.50
Proton 5.0.6