Actually the 1.1 demo is end at that tunnel, i forgot to fix that so instead of showing notify message, it moved you to a non-exist map thus caused the error. (´；ω；`)
Although the 1.1 demo is short, however the actual game had processed much further than that.
The 1.2 demo is coming but the release date hasn't been decided, if you interest, you can follow me to receive lastest new about the game whenever it's available
(and yes, monsters are invisible on map, you can only see them via Radar)
Thank you for taking interest with the game =D I will try harder to have the next demo available soon