Hey BLUE, thanks for posting! I'll look into the bugs after tomorrow's update. And here are some answers:
Nuts & Bolts Indicator - it indicates how much metal you have collected from destroyed robots. After each level, there is a chance for a shop to appear in corridor between islands. Here you can spend your metal on items, drones and health. The shop is guaranteed to appear every 3 corridors - or 2 if you are lucky. So the shop didn't appear at all till the Day 6?
Gameplay - the central area of the map will be populated with things like destructable cars and other environmental objects that can be used for player's advantage. It will be added in the future as I am currently making sure that core gameplay is rock-solid. So that I won't have any unpleasant surprises in development later on.
And yes, I plan to set up a Discord channel in near future - it will be announced in Update Log, so stay tuned.