Looks like a very competent start, outside of the controlling-enemies bug; I used to play these kinds of games when I was younger, particularly the Nippon Ichi games (Disgaea et al). Call me spoiled but I really adored their graphical style; compared to the style of your game, I'm sure you could understand my lack of enthusiasm for its visuals; it's functional but not ideal, almost so-so if I could better understand the nuances of each unit at a glance; they are a little hard to see due to their tininess and low-resolution. The controls could use some work; the classics had a menu you could bring up that let you select what you wanted to do, and I'd prefer that. It's hard to see who is being attacked since there's no animations either for the attacker or the victim. Even a flashing red sprite could help aid to show who was getting hit specifically. Making it easier to understand when the enemy's turn begins and your turn begins could also help.
I know recently Nippon Ichi released Disgaea 1 & 2 for the PC, filling in a niche that wasn't very much present. I'm not sure if people are burned out by the genre yet, but I know I got sick of them after playing them so much. Perhaps you could see success fleshing out a full TRPG however. I wouldn't recommend proceeding with that art style; I'd recommend larger characters that can be more easily distinguished, which opens up the opportunity to make them personable, thereby making the game more attractive to existing fans of this genre; a major part of TRPGs is the idea that you're some kind of team manager, and these are people who you're fostering, to help them grow and get through various endangerments or excursions; the social element is very strong, and so should the representation of the characters in that sense, in my opinion. It's also important to note that the entire battle system (arguably the game itself, unlike other RPGs that have other things to focus on like exploration) revolves around these characters fighting, so it only makes sense that they should get the most attention. When I look at your game, I feel as though the characters are only just as important as the background.
That would be my major thought as to the future success of your project, assuming you decide to continue it: if you change nothing else, change the visual focus to emphasize the characters, the stars of the TRPG.