https://bugs.winehq.org/show_bug.cgi?id=33309
--- Comment #11 from Béla Gyebrószki gyebro69@gmail.com --- (In reply to Sebastian Lackner from comment #10)
(In reply to Béla Gyebrószki from comment #9)
This was fixed for me somewhere between 1.9.11 and 1.9.12 so that keyboard works in the game. The annoying problem with the game frequently minimized to the taskbar is still present.
wine-1.9.14-216-ga615647
Could you check which patch fixed it for you? As mentioned above, I was never able to reproduce the issue with my version of the game.
It was fixed by https://source.winehq.org/git/wine.git/commit/6f2c18609b27a4fe80f3e538e24545...
I think I tested the game only in virtual desktop mode when I wrote comment #8. That's the commit which fixed the issue when using a VD.
The game I used to reproduce the bug is the Steam version (2.0 according to the title screen), and was built on Unity engine 4.5. If you have an updated version of Slender, there is a chance that the game was built on Unity 5.x that's why you can't reproduce this bug.