I liked this game a lot more than I thought I would. To be honest I've played a lot of RPG Maker games and they usually fall into the same pattern and just don't do it for me. Storylines loaded with tropes I don't like, boring environments, and grindey battles. There are definitely some standouts, but I typically go in with low expectations.
I played what I think is most of R's story- ending just after the boss battle with the puppet lady- and a tiny bit of Sappheira's story.
I think what really makes this one so compelling is how it doesn't take itself too seriously and how self-aware it is. Seriously, the humour really makes this game. The characters have great chemistry and banter and the way it pokes fun at conventions and tropes is brilliant.
The mechanics are pretty standard, but they're mostly well executed. With support powers and elemental advantages it's complex enough to be interesting but it's not overwhelming. I did find the balance slightly off with some enemies being unexpectedly OP and elemental advantages not quite working as expected. The use of scripted events mid-battle is done well, and there are enough battles to be fun but not so many that the game becomes grindey or tedious.
I really do like that there aren't any sections with a random encounter every two steps. Those are one of my biggest pet peeves.
It's definitely still rough in a few spots. Placeholder art that doesn't quite fit, as you've mentioned. Text boxes sometimes appear differently and I'm not sure if this is deliberate or not. Following characters don't actually show up in the overworld (is this by design or a bug?). The music choices are good, but some tracks are noticeably better in audio quality than others.
I think the only thing that really didn't do it for me was the environment design. The level design- layout and flow- was decent to good and got better as the game went on. But the environment design- appearance and interactions- I wasn't a fan of. There are a lot of drab mazes with nothing between the scripted set pieces. I'd really like to see more detailed, more interactive environments.
When I get the chance, I'll jump back in and try to finish Sappheira's story, and I'm looking forward to where you take this.