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For some reason, the cursor is very small and doesn't scale with everything else.
(Searching for similar issues didn't yield any results, so I'm asking.)
I tried toggling the "system cursor" option, but I didn't mess with the text tweaker. I'm using the latest version.
I figured out the problem. This happens only when the launcher is set to 32-bit True (stretchable) GDI mode. It seems to be related to the peculiarities of high pixel density (I have a 4K monitor and 250% scaling enabled).
The game looks great in simple 32-bit (stretchable), and the cursor is the correct size. So I'll stick with that. I'm withdrawing my question, but this information might be useful for others in the future.