Really really really great game, I love it! A few suggestions I can give are:
1. Add More Enemies, maybe one who's really fast but a lot weaker.
2. Add a x2, x3, x10, x25, etc speed button, because sometimes the game does get a bit boring when you just sit there watching, so a Fast-Forward Button would be nice!
3. I would love for the game to have like a little "Story", so it didn't just start off with you placing plants. Maybe the story could be that the ink monsters are drawing all over the Earth and you have to use the cleaning power of the plants to stop them [Lol I don't know what I'm saying, just random stuff ].
4. Make Different Modes for the game, like one where instead of defending, you're the one trying to breach through the defenses and destroy the tree.
5. A Tutorial for the game would be great even though it is pretty self-explanatory, but still, maybe for people who are less insightful.
6. Kind of like an "Encyclopedia" icon inside the game, where you can see all of the Monster's Names and descriptions, also the plants'.
7. I would love for the spikes to be able to also Slow Down an enemy, instead of just damaging them.
8. I'm sorry to say this, but the Hedge is just too weak. Maybe give it more health or make it grow faster.
Welcome to this new video, today we're playing "Grow your Guarden", we have to grow our garden, but it's not the garden you might expect. Particular game, and it's free. The tree is so cute! This game is 馃敍馃敐!
That was a quote from my favorite YouTubers, can you guess who it's from?
Also, these suggestions are just my opinion. If you do not want to add these to the game, totally fine! It's your decision after all. Keep up this work! Also I saw you drew all the assets, you're an insane artist!! P.S. Sorry for the extremely long comment.