The creator SUPAI03 also did three other games. His first game, Desperate Mansion, I haven't played but from the looks of it it seems like a comedy parody of RPGM horror games. I have played Heart Nightmare and Tenseint though.
Heart Nightmare completely changes the battle system for the better. It doesn't have EXP or random encounters. It just has boss battles where every boss is basically a puzzle where you have to figure out which of your character's skills to use and when. The first few bosses are pretty easy since those were just for figuring out what your characters do but the later ones can be tricky and took me a few tries to figure out what I had to do. The plot is about a ragtag group of people from different worlds (futuristic robotic world, horror world, kemono world, etc) teaming up to fight a group of interdimensional villains. The Mother inspirations are gone but it's just as crazy as the other games. I prefer AN EARTH 1 and 2, but I still liked this a bunch too.
Tenseint on the other hand I didn't really care for and don't really remember much of since it didn't make as much of a impression. Out of all of SUPAI03's games I consider it the weakest, at least out of the ones I played. The battle system is just like the simple RPGM battles that AN EARTH used. As for the story it's got two going on at the same time that connect to each other. One is about a girl that gets isekai'd to a bizarre school while the other is about a bounty hunter is a post-apocalyptic world.