Have you tested the game on Android? Because after installing the game and trying to start it, the game engine logo flashes for a moment and then there is only a black screen. After leaving it longer, the same thing continues.

tap bottom left or bottom right corner

I tried and the game is slow and most of tiles are missing.

For me worked turning on smooth scroll, walking for a bit, then wait for it to stabilize, then turn off smooth scroll, however if you are  on the left side of the map (varies from map, somewhere it's 25% of left part of the map, somewhere it's only 10%, in the ship for example it's 3 walkable parts of the ship from left) it will erase most of the tiles and you have to go outside of the bug zone and refresh smooth scroll as described.