It definitely needs some balancing, but I still think you got lucky x) With a bad hand you can get some -4 x 3 pretty fast and ruin your score. Thanks for your feedback, I'll give more thoughts to the cards and the distribution (right now it is completely random)
(I just checked, by playing the cards as they arrived without thinking, I lasted 01:11, while I can usually survive 3 minutes, and got up to 6, by playing purposefully)
And you're totally right about the font!