Nice idle game! Looking forward to seeing where this game goes to in future developments.
To the developer: Major bug found when destroying/selling machines:
Obviously destroying machines doesn't give a refund, but it also doesn't decrease the cost of re-purchasing either. That means that potentially players who make high-tier machines accidentally, and then destroy them, will have exorbitantly high costs for all future machines. It also makes switching between resources temporarily not an option.
Developr
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It actually does, as the costs are based off number of machines owned, but the costs only update on purchase. This is fixed in the next update