I *knew* the graphics reminded me of something, and Wikipedia confirmed it for me: this game is basically a port of "Fury of the Furries", a PC/Amiga game but with the Pac Man license. That takes me back to my teen years when I used to read a computer gaming magazine from France called Joystick and which made me quite envious because the Amiga seemed to get so many interesting platformers compared to the PC.
Anyway, great work as usual. I wish I could come up with "walk through walls" codes myself.