I loved the concept of the mixing ingredients and trying to find the cure. As your first godot try I think it was very solid. For the feedback try adding some music, some zombie sounds, mixing fluid sounds, maybe some machine working or a buzz for the machines, make a button to dispose the current zombies and bring new ones for testing, and add more ingredients so you have more combinations. Even a button by the pc to remember your best results in a simplified UI. The mixing to giving the potion to the zombie to analyzing is a very satisfying loop. Great game idea and great job. Keep up :)