What I did to that version was all that I could do. But after finding a version of Hack-O-Matic that I did not have before, I was able to make....
Ghost Trap for Colecovision
In this version....
I changed the blue mouse to a blue ghost.
Instead of an angry red dog, you get an angry red ghost.
I changed the stuff you eat to yellow dots and red dots (for turning into the red ghost)
The first few bonus items have been changed to look like...
a piece of cake
an apple (or maybe a cherry)
a pair of cherries
a bottle with a "C" on it (maybe a cola, or catsup)
The rest of the bonus items may change if I can find them and see what looks good in red.
I would like to make the color of the maze blue, but I don't know how to change colors.
Anyway here's the rom file for any Colecovision emulator, plus some screenshots. If needed, I will try to post larger screenshots (the ones posted are the only size I could make with the emulator I used.).