My main concern with the plants so far...
It's a completely luck based variable. These plants aren't able to properly be factored into an engage, especially with their random time spawning and placements.
In a game like League of Legends where your skill and understanding of the game determines your win, I don't entirely think it's going to be fair or fun at all if a player can now completely turn an engage around based on the luck of them getting a plant they want.
Outside of the plants the game will be perfectly fine, but when the plants factor in and we get interacts like the videos show: https://www.youtube.com/watch?v=mYsw0qINN2c
https://www.youtube.com/watch?v=LVL-zcE5G0I
Is it really okay for a player to put in their everything to win an engage only for all their efforts completely gone to vain based on a luck factor? There is no skill involved with the plants at all other then who can use it first.