Congratulations on your first jam! I really liked the concept and I personally enjoy this kind of games.
Two minor fixes I would add:
- Sometimes you can place artifacts outside of the "map".
- If you place too many furnaces you get to negative wood. You could internally round that to zero, since having negative wood makes no sense in the context of the game (keep the negative value for progression calc, but show the user 0)
Some audio would be nice too! Keep it up!