We play Promise Mascot Agency on Steam Deck a lot, and we're happy to report that it works wonderfully!
It works without any tuning as we detect you're running on Deck and automatically set the graphics options to what we've found give the best results for visual fidelity, frame rate and battery life. A suite of graphics options are included for you to tweak as well.
Some of us play handheld, and some docked with Bluetooth controllers. It rules!
Thank you for all of your support and interest in the game!