Looked good and seemed really promising but like btzr-io said the shoot wouldn't work for me either, even after I got the gun.
Sorry for the inconvenience. The problem is noted. I've tried to upload a new instance of the game, but the bullets seems not to work. But locally everything is fine. Please check my last devlog for more information. Thank you.
A fixed version is up. The whole situation is really complicated, but everything seems ok for now.