Thanks a lot for uploading. As the original Coder I loved to look at it. 27 years ago, we wanted to make the demo a Amiga lookalike, so we thought it might be a good idea, to make it work by joystick control, to emulate a mouse.
To make it work like it was our purpose, ou have to do the following:

Press F12 to enter the emulator settings menu, and the up and down arrows to highlight “Machine Settings” and press the right arrow to select it.
Highlight and select “Joystick settings,” then “define keysets.”
Set your desired controls by selecting each entry in keyset 1. To set a key, press right arrow to select the entry, then press the key you want to use. You need to pick a key for each direction and joystick button, labelled “fire.” (Note: Spacebar seems like a natural “fire” button, but it’s used to pause some games, so I recommend something else).
Back out from the menu using the left arrow key, then highlight and select “Joystick Device 2,” then highlight and select “keypad 1.”

For Screenshots, I made today, looking this piece in joy, go to

https://archive.org/details/equalkickagnusdemo2

For some reason the last demo (number 7) won't start, but enjoy then others.

Emergency doc aka Scan