Looks like the fruit doesnt affect the "of the growth". I feel like i have bad luck as i happen to have 3 crafted and now its going to take a while to craft again one to replace them. I'd suggest to add a feature that allows you to use crystals to "enchant" the weapons again with additional crystal use of say, 3 for the first time then 6/9/12... so on.
nice game! tho i'd like to see an healthbar on the zombies or atleast the number of the damage i do. also a description of the actual cost in points of an upgrade could help (so you dont have to figure yourself how much will cost)
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