I thought the art and setting were really cute! The sprites were pretty well made and the dialogue scenes with the boss were a fun way to transition from stage to stage. I really liked that her sprite changes so that she's mad before the final level. Though I am confused on whether or not the player character is a different person each stage, or if you accidentally changed their name from Bob to Mark between the first and second level.
The foundation for the gameplay was pretty solid since everything functioned perfectly, but I thought the game could've been more enjoyable with a few changes. Like Foxglow Games said, it was weird that there wasn't a distinction between the decorative desks and the actual towers, which were a bit confusing for a first playthrough. The gameplay was a little one-dimensional just because there wasn't really any variety or strategy, you just pay attention to how much money you have and place + upgrade the turrets whenever you can. The final stage got a little boring since you max out the tower slots by wave 3, then have to sit through extra waves that aren't a challenge and take a pretty long time to finish. I also didn't really get any sense of the "Rage Quit" theme apart from the story, but that's ok.
Apart from that though, this is very good for a first game, especially a solo one. Keep up the good work! :DDD