I reached the 5th floor. Not sure I understood how the death mechanic works completely, kind of felt like my choices didn't really matter since I wouldn't lose any progress and became stronger each time.
I think the solution to the movement complaints would be to add something like DAS in tetris, where if you hold a key for longer than a set threshold it automatically starts pressing that key, but still gives you that precise control.
I had fun playing it and the minimalist graphics worked quite well.
Well done!