I'm in the same situation as the OP except that my resolution is 1680x1050.
I posted a thread about this on the steam forums for the game
http://steamcommunity.com/app/228880/discussions/0/371919771742907942/
So far there has bee practically no help.
A developer responded a twice, but since its been complete silence.
First time I was told that it should scale and then it was suggested I try change the settings in the settings.ini file.
This has absolutely no effect, and is being overwritten by the game and reset to 80% every time I start the game.
Making the file read only prevents it from being overwritten, but then settings are just ignored and set to 80% ingame anyway.
Second time I was asked to change the windows DPI settings, this had absolutely no effect either, not that I expected that either.
I'm left with the impression that nobody is really interested in helping or solving this issue.
I either have to stick my nose into the monitor to be able to read the text or strain my eyes to read it.
The former is very inconvenient and tiresome, the latter causes me to get a headache after a short time.
In either case it makes the game completely unplayable for me