Thanks for your feedback! I'm glad you enjoyed our game.
Teaching players the mechanics and objectives of the game is something we've grappled with (no pun intended), as our tutorial is pretty long, and runs the risk of overloading the player with information. As development continues, we're always looking for ways to condense information in the tutorial to be as clear as possible with the player.
We are planning to introduce more weapons in the game, including a shotgun, as you suggested. Stay tuned and thanks for your comment!