I noticed that you use pre-rendered images to make the game, but the map scene is still RTP. If you are willing to use the assets sold by PVGames...
Considering the time and effort invested, I would only recommend that you do this at some point in the future. By the way, the character's walking animation also needs to be remade by you. In order to avoid the rigid RM default 4-direction 3-frame animation, you can use the AnimaX plugin.
Creation is a very personal matter, and others can only refer to suggestions for reference only.