Upgrading GX4000 to 128k RAM is not an issue. The issue is the control settings. On the GX4000, you don't have a keyboard, but to start it requires the Space key. Probably, just adjusting the control to use only the standard 2-button joystick will be enough.
alk0v
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A member registered Aug 03, 2022
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I checked in emulator, it can work on GX4000 with memory upgrade but the issue is control configuration
After start you should press Space to enter main menu and after Esc to configure control. But in the end it is enough to have only direction keys and 2 buttons. But it requires update in the code, unfortunately.