Minicube64 has a debug view that can be toggled easily by pressing tab.
It displays the state of the program updating in realtime, so you can see what it is doing and can help identify any problems.
The top right is a window that shows the main output of the program.
Across the top indicates the state of the various registers, from left to right:
Current program counter
Stack pounter [SP]
Down the left side is the currently executing code as it appears to the emulator.
The middle right square represents the 256 bytes of the zero-page. Here you should see what any active values are doing.
For readability any values in zero-page that are
0x00are currently shown as
Processor flags are not currently visible in debug view.