- Pay for techs as they research:
You don’t have to pay for the full price of techs when you click them, instead you lose proportional resources as they research. For example, castle age is #### 50g, when you click castle you start losing food and gold. By the time you are 5% of the way up you’ve paid 40f 2.5g and by the time your 25% of the way up you’ve paid 200f 12.5g and so on. If you have 0 of any of the resources you need at any one point then the upgrade is paused.
This would probably be op if it included all techs so maybe exclude age ups. If still op then restrict it to blacksmith, stable and siege workshop. Blacksmith to make it easier to squeeze out key upgrades (archer atk, +2 knights, etc.). Siegeshop and stable because they have expensive power techs that can be hard to save for (paladin, onager and siege onager, siege ram, heavy scorpion).
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