No plans to create different transition screens for each costume because I dont know how many I will have although I did sketch a couple based on costumes for fun. So far there are around 40 screens but some need to be rescaled or redone.
There are 4 expressions [<250 deaths], [251-500], [501-750], [>751] and they are tied to the current number of deaths of each playthrough. So if you are playing Easy mode and enter the elevator to load the game to carry on with the playthrough it should change her expression accordingly. Likewise if you start Hard mode or enter Easy mode it will reset death count to 0 as will her expression back to default.
Gave it another go. The different expressions are a nice touch, though I think the number of deaths requires should probably be different for hard and easy mode - you've got a lot more time to die over and over on a difficult part in easy mode, after all.
I actually got the alternate version on the score screen; The game seems to give you a weird score screen when you beat easy mode with 250+ deaths; I seem to always get one of these poses, rather than the regular win screen. I don't think it's related to whether you've entered the code.
I haven't tested the 500-750 range, but 750+ seems to work as normal.
Also I finally noticed the display glitching out on the floor after 12 to avoid displaying an unlucky number. That's a cute touch.
