The idea is nice, make me think of Fidel Dungeon Rescue. A few problem however:

• The fact of not showing the character moving is frustrating. Maybe having a ghost image showing the expected position could have helped.
• The character is moving too slowly when doing the combo.
• When losing, allow the player to retry instead of starting a new room.

In the end, I liked it. It's just missing some detail to remove player frustration.