To sum up this pile of stuff...

- AI characters hate you and demand rediculious things for non-aggression/trade treaties
- More you build up, less BC comes into the empire
- Random game freezes and missing buttons when interacting with other species
- Spies fail mission right after being assigned on other speices planets
- Colonies own revolt way too frequently
- Tech. researched is missing to use after researched
- etc.

Not happy at all with this and feels like a reskin of III

- More you build up, less BC comes into the empire

if you bother to do some reasearch then you will realise that every building has some upkeep cost.
It will tell you in the colony screen where you choose what to build.
You aren't supposed to build everything on every planet.

- Tech. researched is missing to use after researched

that never happened to me, do you realise that you have to choose one option and don't get everything?

But overall the game is definitly still in an alpha-like stage, i agree with that.
It has like half the content and replayability of MoO2, pretty sad.

1. I haven't experienced it yet. The AI seems pretty balanced on that respect so far.
2. BC earning is tough if you try to build everything everywhere without any plan for income/maintenance. Check the stats of buildings and try to research buildings which provide income. Also, make sure to use taxation.
3. So far no freezes or missing buttons. Are you playing with the latest version available here?
4. If your spies fail mission after mission on a specific target, switch target. If the enemy is prepared, obviously it will make it harder for you to succeed.
5. Colonies revolt? HA! You must be even worse ruler than I am! :p
6. Not sure what exactly you mean by tech missing. Missing from where?
etc