The Throne increases the amount of resources gained from sending out troops. the Barracks increases the amount of actions you have for every turn starting on the next turn after you buy the upgrade. The Mine and Farm give a little passive income of gold and food respectively and decrease the upkeep cost but aren't really worth as much to invest in compared to the Throne and Barracks. So you should focus on upgrading the Throne and Barracks and if you had extra gold after those are maxed you can invest in the Farm and Mine.
Proto042
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So what worked for me was to focus on leveling up the throne as that increased the resources gain and then getting a barracks upgrade when I could afford it. The mine and farm don't provide enough value compared to those 2 and can be put off until the Throne and Barracks are maxed. Also each location has a different focus explore is random, the swamp is food, the mountain is gold, and the forest is a little of both food and money.
the gameplay loop is to use a warrior or mage stone then go into the dungeon and fight the monsters in there until you get to pregnancy level 3 then give birth to increase your stats with the clinic giving the best boosts and then repeat until you are strong enough to win the rank up fight which requires you to be at pregnancy level 3. Take on quests to get more gold and then get info on enemies or buy better gear to make fights easier. However remember that you need 500 gold on top of a few other items to make more stones at the blacksmith.
Tried version 1.13 and it works better but it softlocked when it tried to give me another girl after my party was at a full 4. It would not let me close the reward screen and so I could not keep playing and finish my run to see if I could get gold for buying things in the main menu.
Also as a side note it would be nice if we could see whatever girl was giving birth when receiving a new girl so it would be easier to see them at full size since you can quite easily miss seeing it while trying to survive against the waves.
Based on the entries from last year I think it is allowed. https://itch.io/jam/preggo-game-jam/entries