I got the Monster Blues.

[Taz-in-Space]

The no colonizing is just not building colonys.
I also will build no vehicle that the AI design minister doesn't design for me. So far it has made a few dumb moves - example is designing base spaceyards without any spaceyards!! Unless the design minister designs some with spaceyards in them I will only have my one planetary spaceyard. It's keeping my output of monsters limited to one per turn!
I recently lost 9 tiny monsters to a homeworld defence force, so I am collecting a full dozen for the next strike. Maybe I will eventually have an easier time once I get larger monsters.
(yes I do have giant size ones, but so far the minister only created 'mine layer' ship not an attack one. - another dumb decision?)
I agree without these artificial limitations I would wipe the galaxy clean too easy!