I feel like the enemies in Aries do far too much damage. Even with the shield upgrade those invincible laser enemies can kill you in just a few hits! The corridor there is also almost impossible.
The wizzrobes? They're susceptible to your pulse hammer and explosives. Plus they tend to enjoy falling off the bottom of the screen, and their shots don't hurt you on the room border, so I'm usually a cheap asshole and just wait at the edge safely while they go away in bottomless rooms.
And the corridor's entirely optional for the time being - you can come back to it later, when you have more upgrades.
The moving platformers in Cancer are fairly broken. Simply standing still on them results in falling off if you stand there long enough, and since they reset if you move between rooms this makes ascending the moving platform area a massive pain when it should actually be fairly easy. If you bump against the ceiling before landing on them you ofen just fall right through them and thus have to do it all again. I'm specifically hinking of the jump in 4F which is damn near impossible.
...are you talking about Scorpio? I don't remember any moving platforms in Cancer. The far right end of Scorpio can be a pain to ascend, but if you stop trying to move platform to platform the way they're seemingly laid out for you, but look at the room layouts and consider your movement set/abilities, they all have pretty trivial and easy solutions. Pretty much all the rooms with moving platforms are like that.