Ah yes, truly a great game, allowing me to relive the experiences of my ancestors by traveling the seas only to draw a crude depiction of male genitalia on a wall.
I did feel that the upgrades were lacking a bit in terms of oomph. Also I noticed that if you slow down the boat by hitting the A key, the number of obstacles becomes almost impossible to handle. Preventing the player from cheesing the game by going to slowly could have better been better implemented by, for example, including a timer, where you have to reach the next destination within a certain amount of time.