I will be working on the farm buildings upgrade as well. Just nowadays wish to work on spell system.You should work on the upgrade system of the farm buildings, or increase the skill rate of these so that they give better rewards when claiming them.
The latest news!
The fire strike spell can now be upgradeable up to level 8. At the level 3 you will be casting two fire strikes with the same spell cast and at maximum level you can cast up to 4 fire strikes right away casting a single spell. Also, the higher spell level you have the more damage you will deal. However, every additional fire strike will take additional mana cost.
For inspiration thanks to Leo32 and his contribution of Spell - [TFS 1.X] Magic Missile (https://otland.net/threads/tfs-1-x-magic-missile.268185/)