I have not tested on steamdeck myself, (i dont own one :( ) but I DID hear reports from a player that said they were able to play on steamdeck with a custom control setup. I believe they left a review about it on steam. Maybe you can reach out for more info?
Well I found how to get it to play (download and extract the file like normal, go to steam and add it as a non-steam game) but now the problem is that none of the backgrounds are showing. Text comes up and so do the characters, but the backgrounds are all like old tv static. I’ve tried multiple things online to fix it messing with settings, but it just isn’t happening :(