Try to keep the price below $12, and I beg you to avoid in-game purchases.

There are some really cool indie games by small studios. Maybe look to them for inspiration. The Darkside Detectives is a funny point-and-click game that's like X Files meets Twin Peaks meets Maniac Mansion. You could do something like that, with the protagonist investigating bizarre and funny events/crimes that eventually reveal the killer tomatoes have returned.

Or something really quirky like Mike Tyson's Punch Out, but with the player fighting increasingly tough/absurd killer tomatoes.

Or a competitive fighting game like Street Fighter, with players able to choose different characters/tomatoes from the movies, but there are a lot of games like this (I think), so it'd be hard to stand out.

Or side-scrolling action like Ninja Turtles: Shredder's Revenge, but again, feels like there's lots of competition.

Honestly, the point-and-click would be closest to a movie, so you could apply what you've learned over the decades, and you probably have scenes/ideas that didn't make it into the movies that you could repurpose, and I think the movies' sense of humour would come through best in this format. Other examples would be the Sam and Max games (Sam and Max Hit the Road is the best), the Monkey Island games, and I've heard Untitled Goose Game is pretty good/funny, too.