Never liked kaijus.
When a monster is larger than a T rex it's no longer a monster, it's a natural disaster. A tornado can't make you feel hunted or scared the way a large predator can, there's no sense of intimate danger.
That being said the only EDF game I ever had the chance to play was Insect Armageddon which I hear is a spinoff so I guess it doesn't count. Plus I much prefer Infested Planet and Lost Planet (that's a lot of planets!) when it comes to Starship Troopers sims.
The EDF series is basically a tribute to Starship Troopers, Godzilla, Gamera, Ultraman, War of Worlds, and other sci-fi/fantasy stuff but with the campiness factor cranked into hyper over-drive. Most of the common enemies are insects: Giant Ants, Giant Jumping Spiders, Giant Hornets, Giant Rollie-Pollies, Giant Black Widows (or whatever the Aranea is supposed to be), along with mutant not-Kaijuus like Eriganus (whose clearly a parody of Godzilla), Archelus, etc...Of course there are flying saucers, robotic enemies, and 5 introduced Colonists and Cosmonauts who can regenerate destroyed limbs if you leave them alone.
Try EDF 4.1/2025 if you play on PC, as it is fantastic.
if you want a Starship Troopers experience with MASSIVE numbers of insects, bugs, robots, and monsters to fight, EDF is unsurpassed.
Especially the core/main game series. 4, 4.1/2025, 5, and 6 just came out recently in Japan.
I haven't tried Iron Blood but it was an attempt specifically to make a "more" grounded EDF game for western players but it was meh.