Mnementh said:

Hint update:

#18

a) Sorry to keep you waiting!

b) This line is the first what is said if you start the first level.

c) This line is also to understand as a message from the developers, as the series had no release for nearly 20 years before.

d) Before this game released, the fans waiting for a new entry got treated to a Smash Bros character.

Kid Icarus Uprising?