I've played it a bit but was waiting for the game to get updated as there's a few issues currently though today's update did fix the storage issue where you couldn't have more than 99 items even with upgrades unlocked.
Haven't used ReShade much as the game has a problem with display brightness when ReShade is activated though maybe disabling logarithmic depth buffer will help with your problem with the depth buffer as this is a older game.
(Though they moved it to 64-bit and DX11 with this PC port, same as Bladestorm Nightmare which was Koei's previous PC port and which also has various bugs and technical issues.)
EDIT: Disabling RFX_LogDepth in Common_settings.cfg had no effect on depth buffer compatibility.
(With it on and using the depth buffer display key the screen is pure black and with it off it's pure white, both indicating that ReShade can't properly detect the depth buffer or how to say.)