Enemy levels can't be seen on snow tiles (white on white)
When you let the seven day count down end out of town it says "Lose 10%" but my active party got rest 100cm (I had a fourth that was unaffected) I'm pretty sure that isn't how it should work, I'd also say doing a pop-up notice of "Final Day" or "Seven Day" to warn players is important as I didn't realise until there was no way to make it back
Lastly is a mater of Dungeon strength, there isn't any overworld indicator, nor can you always tell by the mobs inside, attempt to do the Cow Ranch (making easy work) then hit the Boss which was several times stronger than anything I face