What KrushBrother says is true, it should look just as good tiled.
were still debating on what to do regarding this.
There is really nothing to debate, it should be a no-brainer to go back and fix it. I have a strong suspicion that the large backgrounds ARE the source of the problem. So instead of wasting countless hours with bugs you can't reliably duplicate spend that time instead doing the game right.
Another option is to reduce the resolution on the game and graphics and see what that buys you.
At the very least your game will have a significantly smaller disk and memory footprint and if you still have bugs then people might be willing to help ( I don't see many people willing to wait through the long load times to troubleshoot the game as-is).
Other than the backgrounds, I didn't see anything glaringly wrong in your events. It seems like it will be a cool game!