The result is very impressive but I'm not sure I have understood the goal of the game :/
A lot of this is testing stuff and the gameplay will evolve as I go along.
It's all about clearing the rocks and grabbing anything usefull from them. The mines are an important part of it. They can quickly clear areas and destroying anything with a mine yields more points and the more entities you destroy with a mine in a 4 second period adds up to a lot more points.
Killing a set number of baddies in one go creates a new 'Receptor'. You have to bounce between these as fast as possible to get lots of score (or energy if you are really low). If you max-out the receptor it adds 1 to your multiplier (at the top). Anything you score is multiplied by that (x1 thru to x9).
The multiplier also increases the number of coloured ores obtained from the rocks, and also increases the spawn-rate of the blue spikey things from the mines. Ultimately that multiplier will have a wide effect on a lot of things, good and bad, but you'll be aiming to get it as high as possible before the level ends. Being killed resets it to x1. :cry:
That must be the longest development time for a game ever xD
Yep. I was continuing it on the emulator until I remembered how difficult it was to make everything happen in one frame on 1Mhz 6502!