Obviously a single gun is going to struggle to take down an entire army. That's only to be expected. AoE weapons like the flamer and extra guns like turrets give the force multipliers that a single shotgun can never accomplish.
The tech tree could benefit from being consolidated somewhat. It would be nice to have weapon researches condensed into broader topics like projectile, explosive and fancy. Some weapons don't get upgrades at all like land mines and others are too far out of the way for boosting a single niche weapon.
Place to discuss the game balance, recipes, health, enemies mining etc.
that was another killer for the shotgun. you used to be able to shoot your normal weapons out of a car before the tank was added, then it was changed to the vehicle's weapon. so you were limited to SMG or the tank cannon. Tank now includes flamethrower too, but no vehicle has a shotgun on it. it reduces the apeal, because you can't use mass manufactured shotgun ammo in your car, but you can with your SMG ammo.
Creator of Bob's mods. Expanding your gameplay since version 0.9.8.