The game prototype has been updated (0.3.5):

• Inventory System added. Now you right click on cards to add them to your inventory. Buy a backpack to increase your max item stack from 3 to 4. Currently there is only 1 dummy backpack: the idea is to have multiple backpacks in the game as part of the progression.
• Bombs! Make things explode :D the bombs are powerful and the price in the shop is way to low for it's power level, but in the current prototype state this is intentional to play around with the new item. Bombs can be chained together (nearby bombs explode when in range of another explosion).
• Misc fixes and tweaks.

Cheers,

Matt