Worth the wait. I especially loved the crawler scenes, love those fellas.
Stage 11 got much harder than it previously was but you are already aware. Aside from that the difficulty is just right when you include going for tickets.
The path switch on 13 was diabolical, you got me there.
Looking forward to next update, I like the gameplay loop. I think adding some traps is a good way to spice up future stages without relying on memorizing longer patrol sequences. Instead of the gas you could have hunter slime trap either dropping intruder into it or getting showered from above. You can also include some hazards that require a bit of button mash to get out of (in similar fashion like you need to mash certain buttons to fully activate).
Another way to expand gameplay might be using Cyntie to work together to solve puzzles, maybe even using one character as distraction - solving puzzle - then rescuing the other character before it's too late.