So, it occurred to me that I've played a lot of KEMCO's Android jrpg fare in the last few years, and I should probably try to actually look at the details and try to summarize it.
I have played 31 KEMCO-published games (25 to completion), virtually all of which cost me $1 or were free. That's on the order of 270+ hours of gameplay for around $25. Completed games average around 11 hours each, and Adventure Bar Story was the only one to crack the 20-hour mark.
KEMCO publishes games from four major developers, and though they're all retro-jrpgs, they each have their own style and evolution, which I've conflated in some places and becomes clearer as I've played more of their games.
EXE-Create made the Asdivine and Alphadia series, as well as the contents of the second KEMCO Humble Bundle (Fanatic Earth, Illusion of 'Phalcia, Journey to Kreisia, Revenant Saga). Their games tend to be longer, have multiple difficulty levels, rely less on IAP, and have the best translations. That said, their characters tend to be identical and the plot sequences, sidequests and worldbuilding don't change much from game to game. They have been steadily improving; I should probably try a few of their most recent offerings.
Hit-Point tends more towards games with monster companions and a variety of ways to grind. Several of their offerings (Crystareino, Justice Chronicles) were on Amazon Underground and I bought several others in their holiday sale (Soul of Deva, Chronus Arc). If you need to grind for materials to craft weapons, it's a Hit-Point game. On the other hand, they're most likely to to put actual puzzles into the dungeons. Their IAP is usually there to reduce grinding time. A bunch of their games were in the Humble KEMCO x HyperDevBox bundle, so it'll be interesting to see how those function without IAP.
Magitec tries the hardest to get creative with their plots, often to the point of cramming in too many twists. They also had a bunch of Amazon Underground games (Grace of Letoile, Soul Historica, Dead Dragons) and a bunch I got in the holiday sale (Covenant of Solitude, Chrome Wolf, Shelterra the Skyworld). They tend to go in for class systems, mission-based plot sequences, and very standard space-filling dungeons that have the same half-dozen styles (take the long way around to hit a switch; one-way doors/traps; sliding ice/walkways; damage floors you need items to avoid, etc). They'll often have cool stuff in their IAP, though sometimes it breaks the game more than others.
WorldWideSoftware provided the first KEMCO Humble Bundle (Eclipse of Illusion, Aeon Avenger, Fortuna Magus, Silver Nornir, Symphony of the Origin, Eve of the Genesis). They're most likely to hide story content behind IAP (if you aren't playing a Humble version), and their translations are sometimes rocky. They've gotten better at designing dungeons in later games, but it's not hard to improve from three open screens with two arrangements of enemies, which was the standard in their earliest offerings.
I suspect I'll continue to play games from a variety of the developers, but I'll likely seek out the WorldWideSoftware or later EXE-Create ones when I next go looking, unless I'm really in the mood for a decent plot and willing to handle the Magitec style to get it.