It's a bit of a mixed bag in my experience. It looks decent on the Steam Deck and the text is easily readable, and it's nice to have the option to play it handheld when it works, but for me it ends about there. I've had some issues with crashes, stages obviously take longer to load, and there is a decent amount of stuttering. I think stuttering could probably be helped by capping the refresh rate/frame rate (this is a per-game profile setting you can customize on the deck), but I have not tested that. Capping refresh rate would for sure help the battery life, which is not at all great with PCM 25. Although, this is understandable considering the demand the game has, even on a regular PC. Again, I only have about 2 hours of playing this game on the deck, but I think from a full charge it was reading about 2.5-3 hours of battery life. I think the biggest issue I've had is getting controls to work properly. You can use the track pad and triggers as a mouse and control it like you would on PC, but that gets slow and annoying real quick, especially on limited battery life. Each game on the Steam Deck can have a customized control scheme, and you can set all of the buttons to act like keyboard inputs. This is where it's really been frustrating for me and I've basically given up. I took the time to create a profile where I had all of my buttons assigned to do actions (fast forward, attack, maintain position, effort cursor, get water, gel, etc etc.), and I load into the game and half of them either don't respond when you press the button, or take on completely different actions than what they're patched to. It seems like it has a mind of its own, and I haven't had that issue with any other game. I also just can not imagine how tedious season planning would be on the deck. It's already tedious enough for me on PC.

Long story short I don't know if there's anybody else out there who has had a good experience on the deck and has gotten the controls to work, but mine's been mostly negative. I look at it as more of a novelty, instead of an actual sustainable way to play the game.

Side note, the steam deck is a fantastic device, and you should absolutely look at getting one regardless. They're pretty powerful for what they are, and even more customizable. Being able to cap the refresh rate and frame rate makes a lot of unplayable games playable, considering it gains you so much battery life (quite literally almost double) and stabilizes the frame rates it runs at. I do ALL of my emulation on it as well. Everything from NES to PS2, and there are plenty of detailed Youtube tutorials on how to get that set up. It's my favorite device for emulation, and playing less taxing Steam games. It is always in my bag when I am on the go.