Is anything about this RPG conventionally good? Nnnnnnnnno.
Did it make me laugh my ass off at how weird it is? Yes.

In terms of technical aspects, it's a mishmash of various crazy scripts that are all actually functioning correctly, as well as what I think are freely-available map layouts and such for the castles, combined with gaining 999999 XP from every monster and a removed level cap, so that you finish the game with five-digit levels, but it's "fine" because enemies scale to your level...

...yeah, it's kinda like that. Also, everyone is dressed ridiculously and acts even more ridiculously, but you get the feeling the designer intended it to be taken somewhat seriously anyway.

Anyway, if you want to experience something really weird it's only like two bucks.

Much like The Rebirth of Kingdom Lo, Resurrection Island is pretty much what it looks like it is - a lewd knockoff of Undertale that's even more furry than the original. Again, the designs and some of the art are cute, but there's fewer jokes with the things on the maps you can interact with. The translation is better, but there's less writing, so it's about even in terms of comprehensibility.
The ero scenes are still a little laughable, and the bullet-dodging segments are quite easy, but it was a pretty amusing way to spend an hour or two. It's about 30-45 minutes long, though you may need to do two playthroughs if you don't qualify for the true ending on your first run.

Lightly recommended, though I still wish the dev would either have better ero scenes (better animation and sound maybe?) or more story/gameplay in a future game. Probably better ero scenes.