We have just been informed via STEAM DECK SUPPORT that due to new Proton updates along with CONSTRUCT 3/4 updates

STEAM DECK Support of Outer Terror not currently available for v1.3 users.

Once again we want to apologize as we work with Steam to get more support from their Deck OS as it evolves with the new DECK 2 as well as other potential support.

The game will in fact work for the following PC gaming handhelds without issue:

ASUS ROG Ally
AYN Odin 2
Lenovo Legion Go
Ayaneo Kun

And is also available on Nintendo Switch devices for home consoles

Here is the messaging we recieved from STEAM DECK SUPPORT:

We want to thank everyone for your continued support of the product, and now that we are available on Home Consoles we welcome you all to experience the TERROR is different ways as well

Thank you for Playing!!!