Fantastic game! I haven't been able to beat him yet but I will need to return to kick Garfield into next Monday!
EDIT 1: finally beat the bastard, but will have to beat him again for the alt ending... Oh boy ;_;
EDIT 2: Got the 2nd ending! no luck, all skill BABBYYYYYYY. But I can't even imagine beating it on Monday mode. Someone with more dedication will have to tell me what ending is present there
EDIT 3: reading the FAQ, I see each difficulty has it's own endings. I cry internally