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* Update the shuttle as fuel is getting inMiquel Sabaté Solà2026-03-151-9/+79
| | | | | | | | | | Just like in the original, the shuttle turns purple for each fuel tank. That being said, due to the restriction from the NES/Famicom on updating background tile attributes, a "half-filled" strategy is being used here to convey the same idea for a total of 6 fuel tanks to be delivered. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Implement falling itemsMiquel Sabaté Solà2026-03-131-57/+364
| | | | | | | | | Every now and then an item will fall and, as in the original game, a fuel tank will be delivered whenever needed. There are still some things left out for later changes, like picking up items mid-air, or background effects for the rocket being filled with fuel. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Initial implementation for itemsMiquel Sabaté Solà2026-03-111-0/+583
This now only supports the appearance of shuttle parts and the fact that the player can collect them at a very specific order and drop them so to stack up the final shuttle. This is of course just the skeleton and there's a bunch of TODO's left. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>