I kept the weapons, units and gear very vanilla so I could get a feel for the mechanisms. No special weapons, no magic or hacking, no extra rules for demons or AI.
5 AI Enforcers; Move 4/2, Veteran d8, Shoot d8, CQC d8, Phys d8, Defence 6, Will d8. Weapons are 4 rifles RoF2, d10 damage. 24"+ -2 long range, and a heavy gunner RoF 3, d10 damage, 24"+ -2 long range.
7 Cultist Marines; Move 4/4, Veteran d8, Shoot d8, CQC d6, Phys d8, Defence 4, Will d8. Weapons are 5 laser rifles RoF2, d8 damage. 24"+ -1 to long range, and 2 SAWs RoF4, d8 damage, 24"+ -2 to long range. They also have a leader who can Rally them and also adds +1 initiative dice if he is up and about.
Disclaimer: Photography is in a poorly lit shed on my phone, and I promised the wife I'd be 30mins max. So let's see what we can do in this time.
Sides as deployed. 7 Marines, 5 AI Enforcers.
A second Marine peeks but is shot down by the Enforcer's SAW gunner. Oops - forgot should have been using d10s to damage; also he should have been only "downed" - not dead. Probably works out fair. His allies in LoS who see him shot all pass their morale checks. Now I should have swapped initiative to the Enforcers here but I forgot. Btw, I shift from using green to blue as my Hold token, as I realise I have not enough greens in my shed box.
Both fail their reaction roll and are "Stressed" - this basically means they can only react to actions directly targeted at them; i.e. instinctive reactions like dodge a shot or fight back in CQC, but they can't snipe someone across the board. I'll remove the Stress in a 'clean up' phase at the end of the turn.
The Marines in the open on the flank are a tempting target; the Enforcer tries to peek but loses the reaction roll and is gunned down, dead, by well aimed shots. At this point initiative should have shifted again - but I forgot.
The Enforcers continue their futile attempt to clear the Marines on their left flank; this Enforcer fires first but misses his shots.
This Enforcer attempts another crossfield shot and again fails his reaction roll and is stressed. Again I forget to change the side with the initiative.
Now a bit of tactics; one Marine goes on hold to cover his ally who then moves into LoS; now he can join the reaction roll in a 2v1. This was cool. Both sides get 8s but the active player wins ties.
Hit by two shots, the Enforcer is "downed" - writhing around on the ground. The Marine leader then tries to finish him off but narrowly misses both shots which spray chunks out of the concrete next to him.
On the other flank, a Marine pops out to confront the Enforcer previously "Shaken" by a long distance shot. The shaken Enforcer is downgraded to d6 and unsurprisingly loses. The other Enforcer was facing away and cannot join in. I prefer 180 vision arcs in games where possible - as it adds a lot to positioning/tactics without a lot of complexity.
Observations: Game works out of the box, as expected as the 'beat 4+ with a dice' is pretty common. Quite a bit of action going on.
I forgot to swap the initiative back and forth a few times (when the active side failed a reaction roll with a 3 or less; and when the active player took more casualties in their action), so it was less dynamic and a bit more IGOUGO than it ought - although the reactions provided plenty of action for the non-active player.
Reacting models do get to use their full RoF, but a failed reaction roll means they are stressed - they miss their turn if they haven't acted already, and cannot react further except at actions targeted at them - which limited the reactions a little. I also forgot to use Suppression fire. Reacting models also all passed their Ammo rolls this game which is probably pretty unlikely, mathematically. Had a vaguely Infinity vibe as models often paused and went on Hold to cover an area. There was quite a lot of care in positioning and facing which was good. Cover mattered as intended. I liked how you could Hold with a model and use it to cover an ally. I may expand this into a Hold+Move simultaneous action.
The jump from 4 Defence to 6 Defence was vast; enabling the Enforcers to shrug off quite a few shots. The variety of dice (d6, d8 d10) made it harder to make modifiers consistent but did make it easy to calculate (just grab the dice and throw). I liked how when a model was downed you had to decide - should I finish him off? - potentially wasting your shots on a model that might die anyway.
I didn't play with stealth or darkness rules (which will be integral to the setting) which would really impact the long-range crossfield shots which happened quite frequently. No gunfight included more than 2 models on each side, despite how I had rules to allow bigger shootouts. The plentiful cover kept the action spread out into chunks and stopped it becoming a shoot-fest, enabling some small 2v1 gang ups and flanking. There was quite a lot of thought put into precisely placing minis out of LoS/angled so they only had to face minimal opponents when they acted.
A lot more to do, but the game works as is, which is nice. I kinda enjoy using my weird dice so I'll stick with them instead of my original d10+stat system.