In short I have two problems, and I'm thinking about the possible solutions. The building problem seems to be bigger than the other.
Resources
Having so many resources could be confusing? could be better to have just two? Or it's fine? so far, it doesn't seem to be a major problem from the feedback I got though.
Buildings
The buildings cards (which give +1 resource at end of turn) aren't considered a "worthy card" so far.
1) Should I replace them with other neutral units, so early in the game there are more units that can attack?
2) just keep them as bonus cards in some specific missions like the second tutorial one, when you need to gather X resources quickly?
3) add some other feature to them. Like make them Wall unit, or have them do some other bonus (like mine could reduce costs of robotic units, building of organic units, etc).
I'm currently undecided between option 1 and 3... but if you have other suggestions

