Cute protagonist, didn't really encounter any bugs apart from that it seems I'm using my main hand sword when trying to use my off hand one, but might just be me not seeing it right. Your block highlighting looks a bit weird like it has too many edges. Also would be nice if you could select hotkeys with 1-0 instead of only with the mousewheel
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There's not actually a different animation for main/offhand yet, so right clicking with a sword in the offhand will play the mainhand animation. I'll add in selecting your mainhand with 1-4, pressing 1-7 with the inventory open will already move items to your hotbar so makes sense to let you select them when its closed too.