At first I felt overwhelmed with the "Training" because there's just so much to know/remember that I felt ready to quit if I'm being honest mainly because for personally I like to learns as I go. For example maybe have a say system where each new day a new challenge is added e.g. day only bombs, day invalid postage, day a 3 can fix invalid postage would've help me to learn the ropes in a progressive way.
However, once I started the game it was not as hectic as I feared the start would be and maybe you did do the system I mentioned but it wasn't introduced in the game outside of the tutorial so I don't know if you did :D Overall, good job