Sorry to disappoint you, but it's only a small game. This was my first Adventuron game and I only had two weeks to write it (although that was later extended to three weeks).
If you like a bigger game with graphics, you might enjoy 'The Witch's Apprentice' and 'Santa's Trainee Elf'. They both have some nice puzzles ranging from easy to medium, or maybe hard, depending on your experience.
For a longer game with a Scott Adams' feel, I really like 'Igor's Quest'. This was restricted to two-word input, two-word responses (which made it really hard to write) and no graphics, but it has some great puzzles oriented around word play.
If you don't mind playing a text-only game, a couple of longer games that you might like are 'Acid Rain' (for something with a bit of an old-school feel and mostly easy puzzles) and 'Captain Cutter's Treasure' (for something with a rich story and some devious puzzles).