Tested on Kubuntu 22.04 LTS. Game never opens and the following error log is shown:

Celeste 64 v.1.0.0
Error Log (1/29/2024 9:36:44 PM)
Call Stack:
System.DllNotFoundException: Unable to load shared library '/home/ema/Downloads/Celeste64-linux-x64/libfmod.so' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable: 
/home/ema/Downloads/Celeste64-linux-x64/libfmod.so: file too short
   at System.Runtime.InteropServices.NativeLibrary.<LoadFromPath>g____PInvoke|1_0(UInt16*, Int32)
   at System.Runtime.InteropServices.NativeLibrary.LoadFromPath(String, Boolean )
   at System.Runtime.InteropServices.NativeLibrary.Load(String)
   at Celeste64.Audio.<>c__DisplayClass7_0.<LoadDynamicLibraries>b__0(String name, Assembly assembly, Nullable`1 dllImportSearchPath) in C:\Users\thenb\Projects\Celeste64_Dev\Source\Audio\Audio.cs:line 82
   at System.Runtime.InteropServices.NativeLibrary.LoadLibraryCallbackStub(String, Assembly, Boolean, UInt32)
   at FMOD.Memory.FMOD5_Memory_GetStats(Int32& , Int32& , Boolean)
   at FMOD.Memory.GetStats(Int32& , Int32& , Boolean ) in C:\Users\thenb\Projects\Celeste64_Dev\Source\Audio\FMOD\fmod.cs:line 995
   at Celeste64.Audio.Init() in C:\Users\thenb\Projects\Celeste64_Dev\Source\Audio\Audio.cs:line 40
   at Celeste64.Game.Startup() in C:\Users\thenb\Projects\Celeste64_Dev\Source\Game.cs:line 76
   at Foster.Framework.App.Run(String, Int32, Int32, Boolean )
   at Foster.Framework.App.Run[T](String, Int32, Int32, Boolean )
   at Celeste64.Program.Main(String[]) in C:\Users\thenb\Projects\Celeste64_Dev\Source\Program.cs:line 19
Game Output:
Celeste 64 v.1.0.0
Foster: v0.1.13
Platform: Ubuntu 22.04.3 LTS (X64)
Framework: .NET 8.0.0
SDL: v2.28.5
OpenGL: v4.6 (Core Profile) Mesa 23.0.4-0ubuntu1~22.04.1, AMD Radeon RX 570 Series (polaris10, LLVM 15.0.7, DRM 3.42, 5.15.0-92-generic)
FMOD Bindings: v20218

the intention was probably to symlink the libraries, like so:

ln -sf libfmod.so.13.18 libfmod.so
ln -sf libfmod.so.13.18 libfmod.so.13
ln -sf libfmodstudio.so.13.18 libfmodstudio.so
ln -sf libfmodstudio.so.13.18 libfmodstudio.so.13