Interesting game! I actually only got to the tree boss as I suck at games. (How ironic seeing that im a game developer :D ) Anyways I could tell the approach you were going for (somewhat i think) If im guessing correctly, the game is about going thru 2020's past events, like the burning tree as wildfires. Im guessing there are more later in for the virus outbreak and for other events. (Or it could be that I over analysed it :P)
Okay so some feedback I have is that I like the cute graphics and the sound effects in the game. There are some collider issues for me at the staircase after entering the boss room for the tree and it was hard for me to manuever the character through that part. The difficulty of the game could be better balanced too. (Maybe an easier level at the start)
Other than that, I think it seems like a great game. Keep up the great work!