Have never played this kind of "DRPG" with the first person view. Looks interesting.
And is that the Disgaea character design?
Labyrinth of Refrain and it's sequel Galleria are developed by NIS, and has a lot of overlap with the Disgaea dev team.
There is a lot of early PC RPGs that have this play style such as The Bard's Tale series and the Wizardry series, Might and Magic too. Then there is stuff like Vaporum, Legend of Grimrock, Operencia: The Stolen Sun, Dungeon Master, and Eye of Beholder. Interestingly enough the original Elder Scrolls: Arena, as in the very first game in the series. Also is a DRPG too before it transitioned into the Open World formula it has.
Shining in the Darkness on the Genesis / Mega Drive and Shining in the Holy Ark on Saturn also are DRPGs.
The entire Etrian Odyssey series on both the DS and 3DS and spin-off of that formula being the Persona Q 1 and 2 games too.
One of the most famous examples is probably mainline Shin Megami Tensei series also follows the first person DRPG template as well. A remaster of Shin Megami Tensei III: Nocturne is getting released soon, also Shin Megami Tensei V which was announced for the Switch back in 2017 might possibly, eventually, maybe, will come out in the next year or so.
A lot of Japanese developed titles also adhere this formula too. Here is a small list. Demon Gaze 1 and 2, The Elminage series, Mary Skelter, Stranger of Sword City and it's upcoming sequel Saviors of Sapphire Wings, Operation Abyss, The Lost Child, and Zero Zanki. Most of these were released on the Vita, but there also ports available on Steam, PS4, and Switch.
Suffice to say it's probably one of my favorite genres.