Hello @NTMan, it looks like this is for a pre-release beta. If this specific playtest becomes unavailable when the main game is released, then this compatibility report should be closed and a separate one made for the full release.
This looks like a possible line of interest from your log: fixme:write_sm1_store: Matrix writemasks need to be lowered. which is immediately followed by fixme:d3dcompiler:D3DCompile2 Ignoring flags 0x8000. and an access violation (c0000005)
Nothing extracted yet.
Compatibility Report
System Information
I confirm:
steam-1809690.log
Symptoms
The game crashes after splash screen.

Reproduction
Always.