Interesting idea, I like that it's about trying to come up with a game jam idea, that's funny lol. The music is catchy, and the voice lines were great! I smiled and laughed a few times while playing, it was entertaining to play.
In my opinion the gameplay is too difficult for 2 reasons: the movement of the gun feels too heavy and makes it hard to line up shots with bad thoughts, and the ratio of bad thoughts to good thoughts as the game progresses gets a little too high. I feel like I ran into situations where I was doing pretty well, and then all of a sudden large bad thoughts swarm all around me, and it's not possible to shoot them all down.
I think if the gun moved faster and more precisely (i.e. it stops immediately after letting go of the button), and if the waves of bad thoughts were less in number, the experience would be more fun. I ended up shooting a lot when things got crazy, and it felt like the good thoughts were destroyed in one hit regardless of how large it was, which felt a bit unfair as well.
Overall though, I think this is a cool idea and would be really fun with some additional polish. Great job submitting this entry!