BUG: An enemy spawned in an area outside the playable area making it impossible to clear the room.
BUG: Rooms that use the Greek temple / pillar design seem to be more CPU-intensive than other room designs as my laptop slows down to a snail's pace and the rooms are unplayable. Performance return to normal once returning to the previous screen so seems to indicate something with this particular room design is to blame. Rest of the game appears to run at full speed so my aging laptop isn't the issue.