Tanks are flying everywhere because they should prevent you from you accomplishing the goal, if they didn't fly, they wouldn't be a threat, and reason I didn't place airplane or something else flying which will have more sense, is historical reference.
The placement of water and ground is result my desire to simplify things, keeping nice looking visuals, but also having minimal effort to get the results I want, so I can to deal with other things.
About unrestricted camera movement, that is not game breaking bug, although I didn't realized before releasing the game.
And about "the assets lifted straight from the asset store" it would be totally dumb to make new 3D models , especially for the result I seek, I would lose most of the time at creating models. I could have made "low poly assets" , but it won't fit in my game style, along with the fact I need to spend a plenty of time creating textures for that models, which is inadmissible in game jam due to lack of time.
The feel like all has been thrown together without any care, this is probably due to my desire to somehow put together topic of game jam( intentional bugs -> weird physics) and topic of my game ( international bugs -> historical references).
Thanks for feedback and sorry for long text :)