The death particles are SUPER cool! few things to take this game to the next level. Maybe after a few ideas, you can add a bigger one, which could be a temporary powerup. Or even a burst shot with the rmb that has a cooldown. An awesome dubstep soundtrack would do loads for this game. Also camera shake for each bullet would give them more impact. Overall this game is definitely a good start for something much more though!
I didn't have too much time to add those extra features. I had only 2 days to make this. I wanted to add music, but I had absolutely no idea how to make some.
Will probably add for the future.
I totally understand, I actually joined the jam with about 24hrs left, so the struggle was real :P .. For 2 days you did a really good job! As far as music goes there are several free music programs you can use. I use fl studio 8 for all my sound effects / music. It's expensive, but you can get a free trial that doesn't end, or have any limitations.
if you want to check out my submission you can find it here: https://itch.io/jam/blackthornprod-game-jam-1/rate/319184