I will let you know as soon as we get a new version of the game, it might take a while since we are reworking almost everything for the final version of the game. Meanwhile, you can follow us on twitter and Discord server!
Talking about the currency in the game, it is related to a lot of diverse features in the game. Such as buying boosters, forging runes (which are an important part of the game, omitted in the prototype. They are related to the color of the cards), buying trinkets, single cards, trading with NPCs for services and using them in the future marketplace. - I know it sounds like a lot of information, but there are some interesting mechanics that we hope to show in the next version. I can also assure you that everything will be bought exclusively with those shards, and the shards are obtainable exclusively by playing the game - unraveling dungeons, killing mobs, trading cards...
About the healing part of the game, I can also say that there will be different mechanics around health. Some cards and deck archetypes may work around the concept of sustain yourself, gaining and stealing life, while other decks may even spend health to cast insane cards and clean up the dungeon as fast as possible.
I'm excited about the features being developed in the final version of the game, and I hope you will be too. We pretend to release some info about the game as we go on creating it. The only downside is that it might take a while since we have a very limited amount of resource to make this project real!
Thank you very much for the feedback ;)