Not OP, but ICE stands for Intrusion Countermeasure Electronics. It's originally from Neuromancer, but I'm guessing OP got the inspiration from Netrunner (which is the greatest game ever made).
Got to agree with all of your points. I feel like there could be some really interesting decisions, here, if the ICE wasn't just a free-for-all. It should also be noted that Ravens can't exist; they can take 0 damage, and so if they've taken 0 damage they're de-rezzed. I'm a fan of the programs, but I don't think they're all equally good, and I'd rather see a smaller list of programs and units with a greater range of utilities. I also want to see a cost, something to make me think about what I'm spawning. I think spawning 8 (or 4, if diagonally spawning isn't a thing) units a turn is a no-go, especially with 20 RAM being the limit. That's a lot of units, and it'll take a long time to resolve all of it.
I think making a Movement action compulsory, along with having a phase where they can summon without cost, trivializes the goal of the game and could be more interesting if there's more player agency as well as a cost/reward analysis that needed to be considered.
What happens when a Hacker is de-rezzed?
I really like the idea, though, and I'd like to see it flushed out a little better. Big fan of the objective; anything that isn't "kill everybody else" is a big plus to me.