nice little project! :)
some comments:
making the intro text wait for input (key press or mouse click) to continue would have made it more accessible. as others noted, the font was difficult to read, and i wasn't able to read the whole block of text before it vanished, so after two times i just hit skip.
then, the game is actually really beautiful, you've done a good job of giving it a greek mythology atmosphere! :)
the battle part of it felt a little long and random. i'm not sure but i think if the values on the cards were a little higher (more damage / more healing) it might have allowed some sense of strategy?
anyways, overall, really good! and congratulations on your first participation! :)