What I liked :
- Music
- Respect of theme/focus
- Some effort on polish
What could be improved :
- better feedback when something is fertilized would be great.
- (I think it's a bug, but the flame thrower also throw vegetable particles...
- Some upgrades will help to play more
- Some variety on enemies/map, begin with tiny field, then enlarge them by removing the forest, and get more aphid, and more dangerous ones.
- Not sure the limitation on gun ammo is useful, as you already need to take care not to burn the plants (witch is clever)
Hope it helps