Thx a lot for the comment and the feedback!
I think the particle issue is caused by the trees's colliders. When you fly too close to a tree, the particle bounces back to the plane. I wanted to replicate the real life firefighter planes' water bomb by looking at photo's and videos. They dump ton of water on a wide area, and it looks kinda like a ball of smoke. I didn't want to do something like a fire extinguisher. I don't know to what extent i managed to do it though.
You're definitely right, there should be a HUD in this game. I couldn't figure out how to implement it to this game but i will add that feature to the game later