Thank you, and I'm so glad you enjoyed it! Your suggestions are very good, too, so I went ahead and implemented the ones I could. I may just remove the GPL tag for now until I have Github set up, or an alternative. I think I was confusing that for the CC tag on the assets.
The enemy slowdown is something I will need to learn more to fix. Some of it is unavoidable, yes (and it's way better than it was when I started!), but I'm sure as I learn more about the tool I'll be able to optimize in more ways.