This game is great, a delightful surprise. I really love the humour from the previous instalments, and this one was no exception. I think the one thing more interesting than using the Easter egg properly is the, uh, Easter eggs involving using the Easter egg in its unintended places.
I really love how this game has music from a wide range of different composers, and it's really interesting to hear what's going to be in the next. I hope the soundtrack for the games would someday be released - all the music is fantastic.
For future instalments, I think it would be nice if the menu option started on "Continue" rather than "New Game" once you've started saving progress. I almost came close to hitting New Game several times when I had progress saved, and while I'm sure this doesn't immediately override your save, it does seem like it could save a bit of inconvenience to those who progress partway through and rapid tap. It's not a huge deal, though. :P
Also, when you use the Heat Blaster in areas where it isn't needed, the last line of the text box reads, "There's a reason why you wear hat." I think that's meant to say, "There's a reason why you wear *a* hat."
See you again in Door 4!!!