Ok, I guess I'm really stuck now and it's not my fault >:( :-\ :'(
I just played Zelda Mystery of Solarus DX when I died and then neither the game over sequence with the red circle nor the do-you-want-to-restart menu appeared. So I can't think of any other ideas than closing the game and hope that I have saved in the last time. I've attached a screenshot to this post. The dungeon where I am is number 8. The game-over sequences usually work well.
Can't remember when I saved the last time :-\ *sigh*
This is a known bug: https://github.com/christopho/zsdx/issues/87
Sorry for the inconvenience :-[