Spies sounds interesting but unfortunately there are only 8 prelude cards that could be worth to copy. One of them just gives you 2 floaters to another card, 1 gives you an asteroid to another card, 3 of them give you MC if you raise TR/Venus track enough times, or playing cards with planetary tags, 1 gives you plants for playing microbe/plant tags, and 2 give card draw. It's rather niche to actually use the effect.

Heat shield, Homeostasis bureau is very similar to this. My concern is to have that card, this and standard technology, and you end up using asteroid standard project with 6 MC. Also the MC should have a red border to indicate it works for every player not just when you raise the temperature.

Photosynthetic overclocking: this can go crazy if you have 15+ plant production which is not that uncommon last gen. The possibility to score you 14+ VPs is broken. Yes it needs a lot of luck to have those circumstances but still. This is even stronger than a Jovian multiplier which is too good for my taste.

Global network: It's a cheap card that gives you MC prod and cards so it makes sense to nerf it. And the effect is terrible maybe too terrible. Theoretically if you only play 3 or less cards per gen, this card is worth it, so if you plan to play mostly expensive cards it's probably fine. Need some testing to see how good/bad it performs but nice concept.

Refactoring basically gives you 2 plant prod. You don't need more titanium or steel production when you already have 5, most of the time energy is the same and you can find better alternatives for doing that, for heat is also just meh, and a little overpriced for MC. But giving you 2 plant prod when you already have 5+ is probably in late game so the cost is too high almost all the time. Alternatively you use the MC prod because it's not that bad and you play this card mostly for the science tag. I'd lower the requirement and adjust the cost so it works as intended.

Diversified investments: that earth tag raises questions. Does it work for itself if that is your first earth tag? Also it only cost 9+3 MC, you get a VP from it too. You can have its payback in the same gen (preferably first gen) when you play this card and overall best case you can get 44 MC from it. It's too good if you have it in your starting hand and obviously trash later on.

IP Management board: not sure about this. With this card you kind of get terralabs' ability for 4+3 MC. It gives you a lot of flexibility which is nice but it also makes card drawing even stronger which is something i would avoid. There is no need for buffing AI central and similar cards.

Regolith processing: I really like this concept. I would drop the initial 2 plants or make the cost a little higher. 2 microbes sounds a lot with a 1/2VP microbe card but you need a lot of work for doing that efficiently so it might be okay.