Is the Tali sprite chubby on purpose? I'm not saying you should change the design(even if it's not my type of tea) but since it's clearly SAO Asuna I wanna double-check it's a purposeful design choice.
Also the Bard's italic test is practically unreadable. The blend of pink on a black background and small thin text is a recipe for disaster. Maybe if it was bolded it might be better.
Aside from that, I've only read this page, but it sounds like you're considering switching to RPGMaker? If so, please please don't.
There aren't very many games that make actual decent usage of the RPGM engines, and the ones that have good contemt could just as easily be made in Renp'y for example. Also RPGM can be just as difficult to code for as either Sugar Cube or Renp'y. There's plenty of tutorials or plug-ins for either of them.
My personal unwarranted advice is to figure out if the combat system is really worth changing engines over, and consider how the other things that would be simpler in Renp'y or SugarCube- conditional variable checks, and lots of them, as well as other systems- is worth the trade-off. It might be difficult to code or get a combat plug-in to work for Renp'y or SugarCube-at least the way you have combat set up atm- but the rest of the systems are unlikely to be done in RPGM as easily as the other engines.
The other thing to consider for switching to RPGM is that this is a work in progress. Advancing and finding content is far far far more tedious with RPGM. Twine, Renp'y, you don't need to actually move the characters to explore, and if you have areas with little or no content it's a lot easier to check them in the other engines then in RPGM. By and large, RPGM is way clunkier to play, generally requires way more plug-ins to not be a slog, and only really fits games where the combat is a central focus-having a bunch of defeat CGI's, having the plot be reliant on battles and featured heavily without feeling like a slog etc etc.
The last thing couple things to consider about RPGM, is firstly unless you're packaging the RTP into the download players will need to find the correct version and install it themselves-a task that while easy is still bound to crop up dozens of questions even when explained in the Original Post
The other thing though, especially as a WIP, is the file size. Even if you try to skim it down by not including the RTP, it's still gonna be a large file, and one users will have to download the full version of everytime it's updated. You can't just release a single HTML file for a bugfix players can pop in their folder, they'll have to download the entire thing every time so much as a typo is fixed.
TL;DR: I think you're underestimating the ease of use of RPGM, RPGM is a huge download hog for a WIP, and in general is way way way more of hassle for players to slog through.