I've known soldiers inc. since the fb version and kinda dissappointed with the mobile version of this game. It's a good game but you need to provide more balance between the big wallet player and the non paying player also the casual paying player. So here are my suggestion :
1. Spec ops need to have minimum rewards either units or resources that's enough to play spec ops agaun or else player can spend all of their units doing spec ops and gain nothing. And even better if you add reward like combat boost or resource boost.
2. Time taken to build units needs to be shorten or change the quantity for making units eg. Making 90 marines cost me around roughly 3 hours at level 7 that takes forever to finish and it's not even enough to play spec ops once its finished.
3. I notice the game only let's you revive troops using resource if the units killed at base, i recommend at offense (raids or cache) player can revive certain amounts of units (maybe 60% of the losses or less) this makes player can do something else instead of waiting to train new units (that takes forever) or you can apply new units called combat medics that can lessen the troop lost at assault.
4. I agree with one suggestion in this forum about bigger vault, u need to make the vault bigger, 100k max is not sufficient, if the base got attacked with all the units wiped than it takes weeks for non paying player to rebuild their forces.
I love this game, love the complexity of the game but because i have to spend considerably more time and money in this game iy gets really boring really fast. I think this game needs more action and we can see more action when we can build reasonable forces at reasonable time.
I see the player at this game reluctant to raid or do pvp because of this, even losing 50k strength takes weeks to rebuild not to mention money if we wanted speed..
More active player means more action, don't let people quit as soon as their base gets sacked or loose all of their troop doing ops