New hard mode is now available as of 1.0.2:

• press H in introduction level to activate
• 12 levels, some quite tough
• a new green friend with double jump replaces the old one
• you can restart level with R, but it should not be necessary
• the basic small friend is no longer slow
• a few surprises ;)

It is a hard mode, so it will be much more of a challenge than the original game. Enjoy !