It's like they knew that the idea behind the game (public domain book characters led by Abraham Lincoln to fight aliens) was so stupid and the execution so half-baked that they didn't bother polishing the gameplay. The character's movement and lack of 'oomph' in the weapons make the game feel a like a throwaway effort.

Other issues are that the enemy designs are super forgettable and the story is basically a 0/10 and can be pretty corny also.