Despite the apparent simplicity of the graphics, it is very fun and addictive: even after having won you still want to play again until you tried out everything! I think, this "coin deck builder" idea was very ambitious, so I'm impressed you managed to end up with something that fun considering the time-frame.
I actually like this assumed style of graphics but of course, there could be some more juice overall that could take over the text that is displayed. Oh and very good choice of the musics and the sounds, those fit very well to the game! :)