I was hoping we'd get some form of doom clone again this year, and this was pretty good!
I liked the basic enemy types, and the muscial instruments as weapons was fun, I really liked the changing pitch on the trumpet! And the repeated fire pattern level texture and the constant metal riffing was a nice edgy touch.
I sadly wasn't able to finish it though as I found I was just getting piled on by enemies. I think another stronger weapon like a tuba or maybe a didgeridoo-like rapid fire weapon would be nice addition in the future.
I also found it a bit wonky sometimes with the mouse smoothing, but that's kinda thematic.
But overall I liked it. Good work!