The update can be downloaded from the itch.io page as a separate .js file from the demo, since i haven't done many change to the demo yet so it would be inconvenience to redownload all the project again.
Change-log:
- Change the code structure to handling save/load functionality (aka fix my past suckness). Thanks @Shiko for the feedback.
- Fix some bugs include @VaiJack8 report of fps drop when changing game variables each frame.
- Get the light layer to draw above the upper layer (everything), intended to use with parallax mapping, as suggest from @Decinbr. Still need tested though (I don't know how to do parallax mapping).
This is a small update since i came back to plugin coding after my personal issues, just fixing feedbacked bugs and adding suggested feature. I'm pretty demotivation now so i hope eveyone can give me more feedback and suggestion  I really appreciate that <3.