Hey guys!
There's a temporary fix for the freezing bug which occurs when you alt-tab or switch to another display. What you need to do is turn off the screen capture function to ensure the best performance for the game.
It goes like this:
1. When in the Steam game list right click on ATOM RPG and select "Properties"
2. Choose "Set Launch Options" and input “-window-mode borderless”
P.S. After we fix the problem it's recommended you change this option back to on for maximum performance.