Thanks for playing!
It's true that it might seem a little weird that mining through previously made tunnels decreases the integrity by the same amount. I thought about making it part of the gameplay to make it decrease the integrity less, but eventually decided not to, as that would make the gameplay a little less fun and way more precise (as you'd have to aim really well to go through the same paths again). I totally understand where you're coming from though! If you do fail a certain level a few times, the time you get for that level increases slightly, making the margin for error bigger, compensating you so you're not stuck forever.
If you do decide to try again, the game autosaves your progress after every level, so you wouldn't have to do the previous levels over again!
Thanks for watching the devlog too!
I appreciate the offer of working together, :) I'll consider it, but I'm not sure if I'll be participating...