Thank you for playing! :)
You can skip levels by selecting a level on the level select screen (I guess level 2-5 was the difficult one). I was thinking about making most levels locked and unlockable, but decided against it both due to lack of time (i.e. my poor time management) and to make all levels possible to play in case one or more turn out to be too difficult or impossible (I did not have time to playtest most of them).