I've gotten overflows to happen at 10 frames per second using Debug mode, but I can't get it to happen at normal speed. I'm going to read the guide again, just to see if it helps any, but I figured I'd ask here as well.
First of all, are you playing on the Linux build? This is important because on Windows build, the game will not allow you to overlap multiple inputs for the same action across multiple keys. In other words, if you are holding Z, you cannot use Enter, which is important for overflows.
Try anything in the game, hold Z and press Enter, such as using the menu. If nothing happens, you're on Windows build and this is very likely your problem. There are guides for installing Linux version elsewhere.
If you are on Linux version, all I can suggest is just practicing. Since you need to do 2 inputs on 2 consecutive frames, you can generally get overflows by accident just by trying to press both keys at the same time. They're not easy to get the hang of though.
Well shit, I did it. Now I just have to get it semi-consistently and I can improve my last practice time.
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