i think the slippery movement of the ship gives the player a skill to improve at which definitely helped keep my attention for longer which was great. i think there are a few things that would really take this to the next level! one is sfx. you might already be working on this since you said its unfinished but i think sound goes a long way. the second thing is either a difficulty curve, i think this would help keep the players interest for longer since once you get used to the movement there isn't to much to work towards. nicely done, and i hope you finish your project!