This adventure is pretty straightforward, bad guys doing bad things need adventurers to clean up. Its not too serious but can be a tough fight depending on how your players do things. Adventure was entertaining and the backstory of the module is also funny.
The final fight as written is a tad too easy. Dinosaurs tend to have low ac and the boss can't really stand up to a normal party if they bring Great Weapon Master and Sharpshooters. The other mooks around it are also pretty easy to dispatch. I would suggest having the Mage inside the room by default to make spellcasting difficult and to throw inconveniences at the players.
Also, Salence is a red dragon veteran with 60ish hp, while the kobold mook guards are gladiators with 110+ hp and more damaging attacks than him. I think the veteran stat block was just put there without contrasting it alongside the mooks cause the second in command as written is too weak. This also creates the possibility of dragging if you use gladiators as written, since thats several hundred points of hp coming down on the PCs. I swapped some out for veterans.