Level 11 "The House of Black and White": I am not a fan of labyrinths with tough timing, but it didn't took to many tries, so I think it is okay (or I just was lucky
)
Level 12 "The Way Down": I liked the level, especially the secret areas were on other places than you would expect them. The way up again is well made, with the fireflowers and the stars it doesn't get frustrating.
Level 13 "i like to -SWIM-": The idea with the wind underwater is great! However, you did the badguy masquerade again
. Seems like SuperTux is missing some underwater enemies.
Level 14 "Burn the midnightlamp": I liked it
. Don't know what to say more...
Level 15 "light way": Again a very good idea with the candles lighting up one after another. I also liked the text that appeared suddenly, reminded me at eyes opening out of the dark. The only thing I want to say is, that you probably should place the candles at the snowy end a little higher. Those square holes in the snow aren't that pretty.
Worldmap: Around the swim-level the worldmap is too plain, Tux has to walk very long distances. I like the rest and the changing sprites give it somewhat of a story.