Hey, cute Miku avatar. I see you're also using Cecil's patch, because some guns fire way faster than they're supposed to. This is because both my mod and Cecil's patch fixes the infamous slow down bug and it ends up adding up, making those guns fire faster. The patch may also cause some unexpected issues, which is why some of these might not get caught in time.
Regarding the issues you found. Some of these are because a fight has been reworked in an update and I guess I messed up some counting triggers. You're also playing on a lower difficulty, which is a bit less tested. And chapter transitions aren't implemented yet. (Each chapter is a separate mappack currently, so linking them up would cause a map to be unable to load, due to the world link not finding the target level.) Framerate issues are of course, a big sticking point for most mappers. I'll try to look into the places you mention. No idea about bouncers. Bouncers are cursed. And Icu-Turso is a constant struggle. I thought I fixed the crashing issue, but it seems it's still there.
Thanks for playing!