I hope this comes off as more constructive than anything, but I don't think I can answer the questions provided because I was quite confused by the game as is, it was pretty chaotic.
Problems I found with the current build
- Sliders were confusing and unintuitive. They didn't appear to have an impact on gameplay, this is likely due to the lack of animations and the fact the sliders were unlabeled (they were labeled with variables names but that didn't help understanding).
- At some point a countless number of enemies were generated, I'm unsure if this was due to slider movement but it slowed down the game. Maybe put a cap on enemy count? Rendering that many objects might not be a good idea.
- I couldn't tell what towers I could pick up, where I could place them, and what enemies they were actually affecting.
- UI and game world layers conflicted and the sliders became overlapped by game objects.
- Cat animation too fast, visually conflicted with the speed of the actual object.
- Gun didn't work, if it did I was unable to tell visually.