The sandbox mode has a really harsh start where you can't afford a gun when you spawn and have to rely on luck to not be attacked by any form of bandits for 20 minutes of none stop trading to actually get any further.
Very interesting game, the fact that i can only dig down and horizontally makes the player have to plan out his strategies to achieve the best resources to advance in the game.
Quick suggestion how about if you have a female and male character every day theres a 2% chance a message says that someone is pregnant and has to stay bedridden in hospital and after 9days you get a new survivor with some of the parents skills?
Shopkeep: Welcome what can i do for you? Player: Hey want to buy 20 heavy machine guns?
Shopkeep: NO IM NOT INTERESTED! Player: But you can have em for any price...
Shopkeep: NOOOO, GET OUT AND TAKE YOUR GUNS WITH YOU!
Tip:
Never put your more reliant troops on the first hero but get popo the giant dwarf and put your most important ones to him. Popo dies the least out of all the heroes.
Poca cosa buy leather - Caganel sell leather, buy shoes - Drushlak sell shoes buy medicine then clothes sell these to poca cosa and repeat twice then when you get to drushlak a third time in the route go 21 degrees to Merdni and buy some good guns and keep doing the route till you rack up alot of dough then buy every person get em well equipped then leave starting area, my stratetgy