During gameplay, type "freetime" to pause the timer. This can be used once per game. It lasts for one level, unless you lose a life.

During gameplay, type "gimmeabreak" for an extra life. Once per game.

During gameplay, type "nomorerocks" to make the rocks disappear. You can use this once per game. It lasts for one level, unless you lose a life.
Also, avoid typing this when a rock is right above a ladder that you will be climbing up on. For some reason, this will prevent your character from climbing up that ladder (climbing down works for me).

Hope those help. 

Note: The green gem you do jump to, but it is safer to climb the vines back to the middle then jump to the left. It is more dangerous but quicker to jump back, but I would recommend climbing the vines back unless you are trying to get gold on that level. I got gold on that level by doing that and going really quick.