Rengoku II: The Stairway to H.E.A.V.E.N.

[LunaMoo]

What you consider "good" is actually ripped of any postprocessing effects in game, you can achieve that simply by using skip buffer effects rendering mode, through other things might also go missing as most games require buffers to draw things and it's not always just effects.

What you consider ghosting is just typical PSP quality bloom when rendered at too high res, we have a hack to reduce resolution only for effects, but it unfortunately doesn't work for all games. When using x1 native resultion it should look like real PSP with blurry glow instead of "ghosting", but unless you actually play in small window and use a shader that reduces refresh rate of the display it might still appear to be more ugly than on the small awful PSP's LCD.

Also this game is pretty bright on real PSP, but it depends on glowing objects in the map, there are lighter and darker places. "Nice and clear" is NOT this game's proper look, it's kind of impossible to find a video from real hardware of it aside of trailer which is mostly grayed out, but you can easily see how eye burning bright it is in some rooms like in https://youtu.be/ZA-JNTofh1A?t=19

So in short the game works fine, you're ruining effects by using very high rendering resolution which turn from blurry to sharp and appear as ghost instead of blurry light. Best solution would be to create a cheat to disable game's bloom and then apply bloom via PPSSPP post process shaders, but if you can't do that, you might simply remove all buffer effects hoping it doesn't break other stuff.

Edit: the shadow not rendering properly might be a bug worth opening issue for, no clue how it looks and how it should look through, so feel free to open a new issue on that part.