Nice little game! I included it in my Kenney Jam compilation video series, if you’d like to take a look. :)

Great job!  What did you build it in?

It feels like an old school game and i liked. 

The only thing i wasn't able to check is your "feature".  Maybe i need to play more. 

Also you should check the boats for collision.

Really fun game! Although I found a cheat (not the feature). You can just hold down space and shoot one boat, and you will constantly send it to the start, gaining more lives than you will loose from the other ships passing.

Overall it was really great, and you made it so quickly!