Spell selection is not very handy but at least you tried to made a cool system :) maybe a selection with other keys than wasd cool fit better ? Also it could be nice to have a health bar somewhere (or maybe I missed it ?)
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Very good points, health is represented by light but it maybe lacks some particles and such to pull it off. I prefer show not tell when it comes to games but its a fair view, I might go for a health bar if players find the darkness ambiguous! I'm aware the selection is unintuitive but thanks for commenting!