Great style but I must admit the amount of towers thrown at you right at the get-go is a little daunting, especially since you can't read any stats of any of them.
Shows great potential, if you continue on it I would suggest railroading it a little bit with different levels, and unlock a handful of towers each level or something
Great job :D
EDIT: Also normally when I play a game about being reincarnated as a gun who has to hire people to protect their holdins I am unsure what the game is about - but when approaching "That Time I Got Reincarnated as a Gun and Had to Buy People to Protect My House" I had a decent idea it might be a game about being reincarnated as a gun who has to hire people to protect their house