Thanks! It makes me really happy that I was able to pull off show-don't-tell tutorials. I've always loved games that do that. I hope I'll get better at it as I keep making stuff.
(Of course, not writing down the names of anything has some drawbacks. Internally, the green shot is called the Heavy Bolt and the orange shot is called the Sticky Bolt--of course, you never really get a chance to see the projectile in flight, but it *is* shaped like a big chunky rivet.)
Re: the final level--the intended solution involves getting the orange sticky bolt and using it to grapple into the tower's mouth. I'm not surprised that there's a way to skip getting the sticky bolt. I'm not going to 'fix' it; I love that there's technically speedrun tech in this little thing.
I also love working in GZDoom. It's a little clunky for certain things, but it's just so good for prototyping an FPS in, and building levels is just so simple.