I actually liked this one a lot. Good tileset mixing without going overboard (loved seeing those plants everywhere), exploration that actually rewards the player, and good sprite usage (finally a level that isn't a jerk with the darned volcano lotus plants!).
The only issue I could find was the time limit could use some extension, as I found myself running low on time not long after I found your easter egg, and considering the amount of stuff you've hidden, it'd be welcome. I also noticed a few cutoff pipes here and there, but I don't think there's anything that could really be done about that (and that stuff has already been discussed extensively in the VLDC discussion thread, I'm not going into it here)
My Let's Play channel
(Current LP: Final Fantasy VI, MegaMari)