I'm having the same issue with Hades. Other games work fine. Aurora & the game both wouldn't start with Proton 9. With Proton 8, the entire Steam Deck froze when activating the trainer.
In the attached photo, "Script error in line 30..." is shown at the bottom right, but I'm unable to get more info since everything is non-responsive.
[Edited by g7hg1emj8q, 5/12/2024 1:11:41 PM]
Use the DirectX version. Make sure you press alt+enter to get out of fullscreen, simply changing setting in the game wasn't enough for me.
The error is about a missing "EngineWin64s.dll" which the vulkan version uses EngineWin64sv.dll