It's a fun game, I love the artwork of the characters! And I love the way backtracking is built into the game... for instance, after I found the green keycard, I knew to go back to the pipe before progressing through, because going forward towards Bean would have been impossible.
Though, after I got the red keycard, I was stuck... I never saw any red doors through the game, and I couldn't find any other areas that I hadn't visited yet. Is there anything past that point?