I made it to Night 7! But only by building a fortress of trees in night 1 to carry me through night 5 and 6.
At one point, it appeared as though enemies were able to get inside the fire/muzzle radius of the weapon, and so I couldn't shoot them. I had to use the power-ups. Some more information around those would be good to see, too. +1 that the tiny window on launch is weird, too.
Nice pixel art! Pretty fun gameplay, too. I look forward to seeing more.