I love Roguelikes and deck builders, so this was right up my street. Definitely a strong fit for the limitation, it was challenging to balance the two central gameplay mechanics but both complemented each other very well - I really wanted the boost to my stats as I got further in, but it was harder and harder to look away from the enemies long enough which led to me taking risks, it felt great when they paid off!
I'd agree with some of the other comments that some more tutorial would be nice - it took me a little while to figure out, but once it clicked I had a great time with this!