I am experiencing the same bug as Holy. I cleared the level and entered the boss room on lvl 5, I could only cast 1 spell and inventory, but not move or anything. Then I lose health but no enemy is near me on the frozen still screen. I died, of course and was doing so well.
I'm so tired of this NOT saving my progress. I'll play, take a small break, and have to start over. It saves achievements, but not medals or progressive money. So sad... this could be a good game.