Indigenous voters tipped Taiwan's legislative race to the KMT

DPP wants to continue the defacto situation as is while pursuing greater cultural distinction from the mainland. They also have some openly pro independence types, and the much more numerous 'independence when it won't obviously get us invaded' types. They tend to be more progressive in general - gay marriage, marijuana legislation style.

KMT is contains most of the 'status quo with less cultural distinction from the mainland' voices. Pro-unification folks too, but that's a minority. Historically they were far right anti communists who ran the military dictatorship, so squaring that circle with pro-unification sentiment has lead to some weird positions. They're also more conservative, often crazily so. I had KMT supporters earnestly explain that Tsai Ingwen was actually a man in disguise.

Largely, both parties want some but differing degrees of economic ties with China. Any other position is impractical.

Indigenous voters are far more likely to be rural, which tends to coincide with culturally conservative.

There's also a very complicated history of ethnic politics in Taiwan. Multiple historic waves of migration from different areas of the mainland, along with the Japanese imperial period. The DPP have focused on Minnan speaking Taiwanese as a locus of independent Taiwanese identity, sometimes to the detriment of Hokkien speaking or other group.

Indigenous Taiwanese had been attacked, marginalized and treated harshly by these successive waves and during the Japanese period, so when the nationalists lost the civil war in China and fled to Taiwan to set up the military dictatorship, they were viewed as something like liberators by many indigenous people.

It's complicated.

From my limited understanding it's split between Taiwanese nationalists (DPP) and Chinese nationalists (KMT)