The 1.03 patch is incoming with the following notes…

NEW - replay game ending (available if you haven't started a new game)
NEW - windowed mode

and

Increased *wait* time for multithread loading (fix for slower machines)
Repost achievements on launch (fix for any missing achievements)
Added app_id file to root directory (for linux testing)
Added / removed keywords and phrases for balancing
Added GUI options for hardware flags and acceleration

——
Note for players running a BETA branch or using launch params:
You will need to reset these options after updating, available in the init.json file (browse local files option from Steam properties) or from the options screen in the GUI.

E.g.
{"hardwareAcceleration":true,"inProcessGPU":false,"windowStyle":"full"}

For no hardware acceleration:
"hardwareAcceleration":false

For the inProcessGPU launch parameter flags:
Remove the –params from your Steam game properties tab.
"inProcessGPU":true

If you have not been running a branch or using params - touch nothing :-o