It was quite easy to heal people without dying if I just spammed k, and I also wasn't sure what all the other colours were for. Five stars for innovation though- I haven't seen any similar games based around covid yet. The audio was fine although you should really look into some lighting and texturing courses in UE4. The concept is fine but the game would be a lot better a lot if you focused on improving the technical aspect- lighting, modelling, textures, etc. Good effort overall!