I'm also having leaderboard trouble, my times never show for Alf's Escape or the main game. In addition, after finishing Alf's Escape, I started the main game from scratch again. First time I died (stockyards, triggering the alarm and being blown up) I got the 'Alf is dead!' message! Only happened once, after that it went back to normal.
Overall, I thought Alf's Escape was fantastic! I loved the harder puzzles (not too bad I found, as long as you quiksave at the right moment!), especially having to defend Abe with the slig under the security room
With the main game based so closely on the original, this is the first really new portion of the game showing JAW's aptitude for level design, which I think was handled with full competence. Very well done, extremely faithful to the original and the new elements like the buzz saws were brilliant! I have complete faith in the team with the next project, whatever it may be!