I have a small question, will you ever add update that allows the player to fuse advance spells?
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I don't plan to add fusions for advanced spells. What I have planned for the next update, though, is spell enhancements - a new type of reward which lets you improve a selected spell in some way - it might be increased accuracy for Fireball, better freezing chance for Freeze, etc. This would allow for further increasing the power of your spell set in the later levels, when you may not want to exchange the spells you have.