Thanks for your comments.
@PurrNaK : We were a team with 3 artists, 2 game designers and 1 programmer. Sadly, we couldn't have the game as we would have wanted because of the "only one programmer".
@jafman30: We definitely feel bad about that number pad thing. But because of the impossibility to have more than 4 keys pressed simultaneously, we decided to use the number pad which seemed not to be affected by this limit.
@Trexmaster: You're obviously right.
 "Other Side"){kind=icon}
 "Titan Project"){kind=icon}