The art style is cute. The game itself is pretty solid, and I really appreciated the explanations at the beginning of each level so I didn't have to guess at the objectives.
There does seem to be some inconsistency in the user interface design. You move using the arrow keys, but you have to click on the goal to proceed? It comes off as odd since you don't need to click anything while moving in the main part of the game, and there isn't anything to indicate that you need to click there. Furthermore, you have to click certain blocks of text on the briefings between levels, but there's nothing to indicate that that is what needs to be done. A button or a simple "click here" line of text would be helpful to address both criticisms.
Don't let that big block of criticism scare you; you did good here!