Hello @MartinPL, because Bridge Constructor Portal is a native linux game and is not using Proton on the Steam Deck by default, that makes your feedback invalid for the Proton issue tracker.
I've gone ahead and forwarded your feedback, but it won't be tracked here.
Nothing extracted yet.
Compatibility Report
I confirm:
Symptoms
Current native Linux build of games have some issue with controls (not all buttons works).
This can be easy to fix by switching to Proton version, so main issue is here that game don't by default fallback to proton. Game have green Steam Deck verify status and configuration "recommended_runtime: native"
Discussion about issue: https://steamcommunity.com/app/684410/discussions/0/3267933887521370592/
Steam Deck Compatibility info: https://steamdb.info/app/684410/info/