I liked the idea and the game looks very promising. However for some reason I was not able to build anything. I collected enough wood and magic core and went to build but the Game keeps saying "You need -X wood".
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I found the MagiStone but unfortunately it didn't help for long. There might be some other things influencing the bug. Now I needed "-1 Magic Core".
This is only a guess but you should check the amount with "greater to" instead of "equal to"
e.g. like this ---> if (magiccore=>5)
NOT like this ---> if (magiccore==5)