This is a great game! But, I want to give some feedback for the next update.
1. Options. It could have something such as "Sound Volume" and "Music Volume", and also to disable some stuff such as explosions when an enemy falls.
2. More Idle animations. I think this should be in the game, as I feel like the idle animations sometimes feel soulless.
3. More plants. This could make the game more interesting, like a a funny cat catapult that can attack both flying and ground enemies with high damage, but needs to regrow. Just an idea!
4. Wave Meter. This would have a meter to tell how much time there is left before the wave ends, depending on how much enemies they defeated.
5. More types of enemies. You could have more types of enemies than the usual 5. Like, a tank target that can resist damage, but only gets hit by explosions. Or a boss. You can make your own type either way!
That's all the ideas I can think of right now. I really hope you could pick one of them! This is just feedback.