Just published build 1.3 that fixes a bug muting the sfx.
Also fixed a bug that appeared for some people with a wrong spawn point in the second level.
Build 1.4 just went live. Fixed a bug that blocked P-29 on one exact combination.
Patch 1.3
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.