Really liked the idea. The mouse sensitivity being low was a struggle and maybe it was my eyes but deciding if it was pink or purple was hard mode :D 

I liked how you threw the letters into their holes and feel like more difficult levels could have it evolved to make harder shots :)

I really love the concept and the gameplay and can see how this could be expanded and add more and more things the player has to deal with on like a day to day basis, new routes, new types of package, weighing letters etc. 

Unfortunately the sensitivity was set so low for me I couldn't complete the tasks in time and for some reason triggered some sort of coil wine issue in my pc? This might just be a me issue but worth looking into? 

Overall awesome concept and take on the theme and can see this being expanded in so many cool ways! Good job!