I don't know if ur already planning to replace the eating animation with a sex animation but if u do plan on doing that I have some ideas that I wanted to share this game is a great idea lowk high potential.
1. You should make all the zombies and chomper futa and make it an option in the settings to choose if u want it futa only or not.
2. Make the sex animation related to the pose they have like since the peashooter has a big ass circle for a mouth when the zombies reach it they will start fucking her mouth when they reach the shield walnut they will fuck her pussy since shes in that position same with sunflower and just keep going based on the position they have also chomper if u make it into a futa the animation should be her or him fucking the zombie instead of munching on them.
3. A gallery since we can't really jork it while playing cause it can get intense.
4. When the sunflower produces a sun you could make her have an visible orgasm.
5. I would like if u made all zombies and plants girls since that's just common in the average sex game and if u want to make it for more sexualities you can make it an option to change between all girls and mixed.
6. A slow motion could be nice to enjoy the animations, like I can't really see what happens when cherries explode.
This game has great potential keep going love it.