The old school comic strip style art combined with modern humor makes it very appealing visually as well as comically.
The use of classical music like Morning Mood adds a layer of irony to the whole chaotic situation that Jim finds himself in - which I find absolutely hilarious! Nothing says "high stakes" quite like Wagner's 'Ride of the Valkyries', right?
And let's not forget about that mouse who seems to have more control over Jim's life than he does!