Okay so! I am very excited to share this but to explain my situation:

for a while I've been stumped on why some of my mods weren't working when running this game on Linux via Proton, and I was especially devastated when PtM wasn't working, as for me it's a very essential mod.

Mods like SBCameraScroll and Improved Input Config: Extended weren't functioning either, even if SOME mods still did.

So, i've been doing research, tried many things, tried reinstalling the game completely, tried to slowly enable mods to see if anything was conflicting, but that wasn't the case.

HOWEVER! I've FINALLY found a solution that worked for me and think it'll be worth it for you guys to try as well!

This isn't my idea, credits go to This reddit post for this super smart solution, but I will refine it below to make it a bit more readable.
I'm just here spreading the word!


If Rain World isn’t installed:
- Install it and run it once. (This generates the Proton files)
(it might be smart to also reinstall Rain World in general before trying this but, I didn't and it worked for me still, so, see how it goes for you)

1. Go into Desktop Mode on your Steam Deck. (Only for Steam Decks, if you're on a PC then skip this step)
   
2. Open the Discover Store (or however you install apps) and install Protontricks if you don't have it already. On distros like Nobara this comes pre-installed. (There's probably many ways to install Protontricks and it differs for each system so just do a quick Google on how to for yours)
   
3. Search for Protontricks and open it.
   
4. Select "Rain World: 312520" in the game selection menu that shows up.
   
5. Make sure “Select the default wineprefix” is selected, then press OK. (NOTE: You MAY get a red warning about how you're using a 64-bit wineprefix, but just press OK and ignore it.)
   
6. Select “Run winecfg”, then press OK.
   
7. In the window that appears, look for “Windows version:” at the bottom. Change it to Windows 7.
   
8. Go to the Libraries tab in that same window.
   
9. In the “New override for library” box, type or find winhttp, then click Add. winhttp then should get added to the list of overrides.
   
10. Click Apply, then OK.
    
11. It should automatically close the winecfg.
    
12. Just close the Protontricks window as you won't need it anymore.
    
13. Run Rain World again.
    
14. Go into the Remix Menu and disable all your mods. (Skip if you don’t have any mods enabled — and official DLCs can stay on.)
    
15. The game should force you to reboot when you apply changes.
    
16. Open the game again, go back into the Remix Menu, and enable Push To Meow or SBCameraScroll or whatever mod isn't working that normally should.
    
17. Start a game and test if it’s working.
    
18. If it works, enable the rest of your mods.

And there you go! In my case, Improved Input Config finally started working, and the meow button finally worked again.

To explain this, the main culprit was the winhttp library.
Proton/Wine implementations of Windows libraries aren't always complete, and some Linux setups provide partial support by default, while others don't, so mods that rely on winhttp can fail unless you manually add the override yourself.

But if this fixed it for you, i'm glad! Have fun my dear scugs~