I really want to give you points for being ambitious enough to go for a series with long episodes like this. Seriously, it isn't easy at all.
The concept is cool and it's completely acceptable to basically do an adult Powerpuff if you ask me, but you definitely need help with the writing. It spends too long explaining to the viewers what they would figure out naturally and immediately anyway. In the eleven minutes of video, the viewer probably only experiences like two minutes of learning new stuff, and none of that is executed too interestingly. Look, if you don't want to do comedy, if you don't connect with comedy, don't feel obligated to toss jokes into the animation. It doesn't have to be funny, you can do a straight up action/drama series if that's what you want, especially if your jokes will feel forced when you try them.
The art style is pretty nifty, and yeah the animation itself is a bit clunky but that's just a skill you build over time. What am I gonna do, tell you to get good? You're in the process of improving as an animator, this is the process. Animating. It's sufficient. It moves. It's fine while you improve.
The voice acting was decent enough in truth, had its ups and downs but generally fine, I liked all the VAs. They were more hurt by bad writing and awkward timing than I think the script was hurt by them, not to say they were perfect, but they were fine to me.
If you want an action/drama, I'd say to go for it, kill mom, make the brothers go it alone or something and start making things more intense and serious in that style direction, changing your mind on the lighthearted kids show comedy guff starting with episode two rather than rebooting episode one. If you DO want to keep it in this creative direction, that's fine, you should create what you'll be into the most, but I'd say bring someone else on to help you with writing or just give yourself more time and attention for it. Work with your VAs a bit and make sure everyone knows the full scene, the context, how the moment itself plays out so they can act more or less intense as needed. Work on your timing, don't focus so long on anything, viewers will piece it together much, much faster than you're animating it for.
But hey, you're catching a lot of flak here in the comments, don't take it too harshly. A lot of people enjoyed this a lot and had no complaints, and the ones who wrote you the negativity are writing it because they see potential in it, they're slightly interested or they wouldn't write. Don't let it fuck with you, and most importantly, don't let it fuck with you to the point where you have to straight up ignore the criticism to avoid feeling discouraged, because a lot of what folks are saying is pretty constructive.
I wouldn't say you need to give up on the project, but you either need to be truer to what you actually want to be creating if this felt a little forced for you, or really polish up this path for yourself on the topic of the Scarlet Steels.
Good luck, and thanks for the animation.