Great to see another godot project here! :)
The windows file says FliperLinux.exe, this is confusing. And I strongly recommend you putting the .exe and the .pck files together in a .rar or .zip file for next updates/projects, this can be something that throws people of your game. I work with Godot too, so I know it needs the .pck file in the same folder, but not everyone knows. Anyway, just some advice.
The idea is nice and the character sprite is great! But you got to fix those collisions! And sometimes the game just stops responding the inputs.