To make it easier to explain this issue, I number the fuels. If I pick up fuel 1 and destroy the slug, not in every level it unlocks fuel 1. So if i restart the level, fuel 2,3 or 4 might be unlocked and 1 is still locked. So if i pick up fuel 1 multiple times I unlock 2,3 and maybe 4. I hope I explained this well enough for you....

Nice can't even spell your game right.

Issue: When winning a level, you may press the restart button to restart the level, as expected. However, after a few seconds, the next level will start instead. I would expect the current level to continue instead. It's a minor issue but a bit annoying if you wish to replay the level to, say, go grab that fuel can that you missed....