The game looks beautiful--not an easy thing to do with 1 bit and low resolution, but everything is clear and elegant.
The central mechanic of reaching your goal by climbing a staircase made of your own corpses is brilliant. I'm not sure I've seen anything quite like this before. (It reminds me a little of Lemmings, yet the mechanic is different.)
That said, the timing windows in some cases were very unforgiving.