A lot of healing special cards! At one point I had 5 but lost some due to blending. I thought I was invincible but then stepped on a carrot who knocked out my blended 14 defense card and killed me in one hit...I think I may try the seed again to see if I can make it through this time aware of what the carrot does.
In a different run I got an Escape! Now to find the use of the Mysterious Artifact...also I hate carrots! I'm not sure how they work just yet.
First impressions are I would say the first level is pretty hard unless you send yourself a card in the rocket then it's much more managable. I would say overall the game relies heavily on your card managment and board strategy. The only thing that I think makes it a little easy is the frequency of health powerups. I usually end up with a ton of tokens because I don't spend them much on healing. I may have just had health power up heavy seeds though.