Love the concept, and the difficulty level is just enough for a challenge without being too stressful :)
It took me a while to figure out how the moves worked, probably because I didn't hover over the UI to see what the text said. It's simple enough that a quick tutorial would fit well - cards, moves, lives and end of turn.
Needs more levels, of course, since it is still in development. Maybe you could add random levels after the victory so that I can keep playing with my upgraded cards and see how long I can last.
I really want to move onto the treasure at the end to pick it up too :)
Looks interesting, but unplayable. This is on Windows 7 64 bit with Chrome Version 49.0.2623.87 m. The cursor started lagging by half a second or so on the second game screen, straight after I clicked a black shape. It is freezing the whole browser window for several seconds a couple of times a minute.
 "Pawnbarian"){kind=icon}
 "Alice is Dead Episode 3"){kind=icon}
 "Solipskier"){kind=icon}
 "Accelerator"){kind=icon}
I have made a webgl build... but it's on Newgrounds...