Hi,
I'm playing Underrail on a Tablet, specifically Microsoft Surface Pro 2017, and everything works nicely except pen(stylus) input. I have to tap everything twice. It's a bug in input handling code, should be easy enough to fix in WndProc() Win32 API, just add WM_TOUCH handlers.
There are 2 fixes for this until it is fixed in the game code:
1) tap and swipe a bit, that activates a click
2) Use "autohotkey" program with this script:
; surface pen fix for games which don't have touch support, so you don't have to double-tap everything
LButton up::Click
LButton::Click Down