The milestone arrives amid strong critical attention and streamer interest, and follows the game's recent release on PC and Nintendo Switch eShop.
In a message posted to Steam, the team confirmed the figure and described the critical response as overwhelmingly positive.
The developers said they had seen players reacting with a full range of emotions — laughter, tears and even throwing controllers — and noted that some reviewers and streamers have placed the game alongside major genre entries such as Lies of P and Sekiro.
The team called those comparisons "unbelievable praise" for a studio of their size and thanked players for making the launch a success.
The announcement provides a clear sales milestone for the title in its launch window: more than 150,000 copies sold across all platforms within the first week.
The developer's post served as the primary source for the figure; no platform-by-platform breakdown has been published.
Nintendo Switch coverage has been prominent.
Nintendo Life's Switch review, published after launch, reported that the Switch version suffers from performance issues at release.
The review noted frame-rate and stability concerns on the hardware and suggested that future patches could potentially address those technical problems.
The developer has acknowledged the issues via community channels, and players on Steam and the eShop have been discussing both the game's creative design and its technical state post-launch.
The combination of early commercial success and high-profile comparisons in the press and on streaming platforms highlights the game's visibility during its opening week.
While the 150,000-plus sales figure marks a clear early achievement, the developer's public statement focuses on gratitude for the community response and the critical attention the title has attracted.
For readers following the Nintendo Switch release, monitoring patch notes on the eShop and official developer channels will provide the most reliable updates on technical improvements.
The developer's Steam announcement remains the confirmed source for the sales milestone record.