TL;DR - If you appreciate games with personality, and also like shmups, stgs, bullet hells etc, give Danmaku Gladiator a try. There is no trailer so here's a video playthrough:
Some parts of the game may not be broadly appealing, such as the really random powerup selection and a rather inconsistent difficulty spike on the Champion mode. However, figuring out strategies for both of these elements makes for a game flow that I personally find really satisfying and dynamic. Sometimes you'll be a bit underpowered while facing a strong boss, but you can still win. Sometimes the game will bless you with good powerups making it a lot easier, but with the 0.1s invuln frames you can still die.
More than anything, instead of focusing on broad appeal, it feels like Kanzaki focuses on making a game that they personally would enjoy. As a result, it's brimming with personality, and there's really a sense of style to all of Kanzaki's games. If you're the kind of player who thinks imperfections may end up making a game better, then I think his games may be for you.