Thank you very much, very happy you enjoyed it! The helicopter enemy is definitely a little harsh at first, I probably could've made it throw bombs a bit less frequently. Though it is also kind of the "endgame", there's no other enemy types after it. If you manage to kill it another will soon spawn, along with lawmen, along with shorter intervals for obstacles, etc., so I'm fairly certain everyone will eventually meet their demise.
Thanks again for your kind words!