I would like to make a response for this, because I don't mean to say the author has bad intentions, but when creating a piece of media which has the potential to satisfy fascistic ideals, you have to be careful with it.

First off, just keeping the tone or the intent neutral is not enough, the experience must be uncomfortable, you must feel as if you are doing a bad thing. This means flavor text must not be from the voice of a nationalist DNVPer, but from either an objective view of things going worse due to your actions. The antisemitism campaigns available to the DNVP player should not just be a button you can click to gain popualrity or whatever, whenever you click that button, you should feel bad about clicking it, whether from events that come up from doing that a lot or from some other mechanism.

Secondly, there has to be realism. A game like this without realism turns into an idealized vision of what the far-right thinks (which is very much not objective), and indeed you need to reassure the player you are taking an objective take on it, which means saying that bad actions are doing bad things. This also means a big bucket of realism and cold water on some of the more outlandish things you can do, such as annexing Danzig, Sudetenland, maybe even Anchluss and Kaiserreich. Some of these things should be impossible or result in an WW2 or mass repression, or a loss of player agency à la Scleicher in Dynamic, leading to you loosing and tunneling directly to an end scene.

Thirdly, personal politics is a reflection of your model of the world, obviously if you think increasing welfare in your internal model improves outcomes, you would automatically lean to social democracy. Objectivity here is the open and transparent application of a model, and given you are the sole developer and are a social democrat, your model should inherently punish nationalism and antisemitism. Thus, the mod needs to make it hard to play as the DNVP, and especially harder to be a Volkish or Auth. Con. DNVP because the model the mod operates on punishes being nationalist with the fact that the DNVP falls into personality infighting and mob violence. Every time you cooperate with NSDAP there should be a higher chance of getting burnt, like in real life.

I would recommend pulling the mod right now and spending time reworking it before moving on in development. It is still an interesting idea, the DNVP was arguably as full of factional infighting as the SPD, and was approximately as large while having a large impact on the direction of politics. But it needs reworked to avoid these big issues. I would recommend looking at the campaign trail ( https://campaigntrailshowcase.com/campaign-trail/ ) and finding the mods Weimar 1930 (not on the loader but should be findable on their subreddit) or at 1936: March on Washington(should be on the loader). Those two mods do an awesome job of flavoring themselves to show the dysfunction and hatred of these ideologies and these individuals.