Hi
Thanks for such detailed response!
Definitely need to add more variety to the levels themselves and enemies. The idea of milestone with achievements is very good too. The controls were mostly tested with the forward arrow and mouse, I thought it played fine. The control was left from the original idea, when I wanted to make the world behind the back to change unnoticeably, but the implementation did not work out very well. I didn't go for a particular rare disease, rather I wanted to show the difficulties of people with vision problems.