Thanks for making the game. It took me a moment to realise how things worked, but was able to make a few gold before the dragon turned up.
I liked the sound effects and the dragon, but think it could be better with some music to enhance the mood in the shop and the battle. I also think having some recipes available to review, and a way of increasing or buying ingredients would also be nice.
Definitely matches the theme though, poison is the whole point!