Read this people, my entire experience...
At first, it took me 2 playtroughts to understand the gameplay, the armor recovers your health plus armor, sword your damage, weird sword gives you a 1 hit kill, potions and a dollar (the green item that goes for 500)
If you tried to go only for sword damage, you will die, simple as that, you may last till day 6-9 but never 11, after the day 11, dragons arrive, the best thing you can do, its buy only armor, and go rambo with your dagger UNTIL you find a green ticket thingie, if you buy it, you will win +1500 up to 2000, with that money you will be able to buy anything, to kill the dragon, if you are lucky and got all the armor you could, and saved your potion, you may kill it, the best way its to buy the weird sword item (grim edge) just before day 11.
I feel i did good, i killed 2 dragons, the first one was a 1 hit kill with the dagger on day 11, the second one was a gruesome fight at day 14, but then i got buttfucked by a dragon at day 16, really? 1 dragon, no elixirs, you are hurt, and you get to fight a THIRD dragon? ¬¬ I enjoyed the game :)