Hi! I'm one of the developers of the game and made the pixel art for the characters.
None of the art seems to be backwards. The character shooting missiles was supposed to be a ninja/rogue/assassin kind of character, it's holding two daggers backwards. The main character is a wizard/mage/sorcerer, the thing that could look backwards about him is the cape.
I agree with you that the game is too easy at the end. We made much of the actual progression last minute.
We simply didn't have time to polish the art to make it more obvious what it represents, test the game, etc. There was actually supposed to be animations as well, I have made them, we just didn't have time to add them. We might continue development, so you could check this out in 2 months or something like that and see if it has changed, if you want.
(The game was made for the GMTK game jam and that's why we were short on time, in case you found this from somewhere else)