Cool idea! Sometimes drawings spells works strange, but it's nice mechanic. I don't know anything about balancing game, but I think you can design cast of enemies with unique vulnerabilities and resistance and avoid one spell spamming. You did a great job!
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That is actually a really good idea, I think that and also I made lightning despite being "harder to cast" a weaker spell unless you have a bunch of the super low health guys compare to the hexbolt "line spell" that was super easy to cast and one shot them and the other weaker ones too. Thank you a ton for playing and this is some really good feedback