Thanks for playing and for the feedback! Multishot is actually working as intended: the extra bullets fan out around your aim, so with 2 bullets they go on each side, and with 3 one goes straight where you aim. I get that it can feel off though!
About the first level, do you mean more variety in the zombies, or more decoration on the map? Curious what felt missing.
If you'd like to chat more, there's a Discord button in the game's hub, I'm there and always happy to talk ideas. Cheers!