I'm sorry to hear that :(
I don't really know what the issue with the linux build is. I sadly don't have a linux distribution to test the issue atm :(
I'll try to fix it and get back to you.
For the web build: What do you mean by "points upwards"? Is your mouse trapped by the game and but you can't move it?
I downloaded it too and yeah it also freezes however running it from the terminal gives these errors:
ERROR: No loader found for resource: res://03_Assets/Visual/3D/KayKit_DungeonRemastered_1.1_FREE/KayKit_DungeonRemastered_1.1_FREE/Assets/textures/uploads_files_2071355_Hand+Painted+Grass+Texture/Stone_Height.tga (expected type: Texture2D)
at: _load (core/io/resource_loader.cpp:358)
ERROR: Can't load dependency: 'res://03_Assets/Visual/3D/KayKit_DungeonRemastered_1.1_FREE/KayKit_DungeonRemastered_1.1_FREE/Assets/textures/uploads_files_2071355_Hand+Painted+Grass+Texture/Stone_Base_Color.tga'.
at: parse_variant (core/io/resource_format_binary.cpp:459)
ERROR: Failed loading resource: res://.godot/exported/133200997/export-dc5401557cd055c9e3dfe30c281322b5-grassmaterial.res.
at: _load (core/io/resource_loader.cpp:343)
ERROR: Can't load dependency: 'res://01_Scenes/Objects/GrassStuff/grassmaterial.tres'.
at: parse_variant (core/io/resource_format_binary.cpp:459)
ERROR: Error when trying to parse Variant.
at: parse_variant (core/io/resource_format_binary.cpp:503)
ERROR: Failed loading resource: res://.godot/exported/133200997/export-82a8f12a71db8751a2abf025b9b92ba2-opening_cutscene.scn.
at: _load (core/io/resource_loader.cpp:343)
WARNING: ObjectDB instances leaked at exit (run with --verbose for details).
at: cleanup (core/object/object.cpp:2641)
ERROR: 6 resources still in use at exit (run with --verbose for details).
at: clear (core/io/resource.cpp:810)
Also I noticed that the linux version is 30 mb smaller than windows and mac maybe "opening_cutscene.scn" was corrupted in the linux export? since it is mentioned in the error log. The windows version work through wine tho
