Well developed MC, side characters so far have been sparse but still good. The overarching story is definitely interesting and I can't wait to see it develop as the story progresses.

MC figured this all out from an off-hand comment by Lady Eve about him improving quickly

Reader gets upset that the mc in "SHADOW SLAVE" becomes a slave. Who'd have thought that'd happen???

how do they have a fridge? If the setting is the same as other medieval fantasy games, fridges don't exist

you are overthinking this. This is a world of magic where physics is ignored. In this same chapter, we are told that force is mass times acceleration. If that were true then for his damage output to double his mass would've had to double as well(or the shadow could've doubled his acceleration and in this case physics would be in play here) but we all know that shadows/darkness don't have mass, so clearly we can't view this through physics.