Going down stairs and initiating combat causes the player to lose mobility in the next area and combat music to play but no combat sequence happens.

I couldn't enter new game after I exited to main menu from in game.

There is an audio listener on the camera created by nani-novel that needs to be removed. Once removed the audio listener on Hiro's camera should probably be re-enabled.

Currently input keys are not always responsive when trying to change direction while moving.

Currently monsters won't activate combat properly while chasing a player if the player is moving.

Basically you have phantom glow affects on each map which is dependent on the position of the 'ground' object. The transform of each sprite needs to be shifted by how ever much the ground is shifted. Then once all the objects are shifted you would have to shift the entire ground map to 0,0 to sync everything up.

Is this an easy render fix or not is the question.

Right now random monsters get stuck as they try to go into a wall over and over.

Current pattern for spotter monsters to see players is a square: 3x'sight distance' :

xxx
xxx
xxx
xxx
xxx

Version in rpgmaker was more like this:

-x-
xxx
xxx
xxx
-x-

Sprite Animations need to be based on time.deltatime. Otherwise variable processor speeds will greatly diminish how the game looks.