Thank you! These are all things I definitely want to improve on, for instance when targeting a spell Im going to try to make the target start on the nearest enemy instead of on the player. Also I've already changed static charge to only work for 3 moves after casting a lightning spell (but I'm waiting until ratings are over to publish more updates). Audio is definitely a big undertaking I want to tackle too, hopefully in a satisfying way.
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You might want to try out this set https://opengameart.org/content/512-sound-effects-8-bit-style at least temporarily. I feel like it would fit the overall game mood :)