Short and sweet! Very well made game. I can't emphasize enough how good throwing the cards felt. And the art and sound in general are great aswell,
I liked some rooms more than others, in my opinion all the best rooms had the enemies come to you from multiple directions forcing you to engage in a game of bullet hell, while in the other rooms staying near the corner and shooting was sufficent, which is obviously not as fun.
I also didn't understand, how do I roll for difficulty before the actual game starts, so maybe level design is only an issue on the lowest difficulty.
All in all - great game, that nicely fills it's playtime with enjoyable content.