Going to post my thoughts on both games here for concision's sake.
These are both pretty nifty. I really dig the glitchy spectrum-port looking graphics, and the music's spot on.
I like how the combat feels different in both games. Like, sure, you can fire in all directions in Soldier, but in knight you can kill multiple enemies with a single shot. It would be neat to see one more level of depth, like combo or accuracy bonuses, or some kind of powerup. Having a couple levels to beat would be nice too. But the games are nice as-is.