No, you should be able to download it without purchasing again.
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Oh, okay. I'll see if I can make a version that'll run on EasyFlash3. Shouldn't be hard.
Edit: Yes, this won't be a problem, so expect an EasyFlash3 compatible (basically a 128k Ocean cartridge image) version later today.
Yes, as long as you have a floppy disk image mounted (if you're using an emulator). I've tested it with VICE and it works fine. Just have to mount the disk image first when booting the game as it auto-loads the high-score table then.
For a real C64 should also work with a mounted disk image via a sd2iec, or a 1541 with a real disk.
Every enemy attack wave you completely destroy drops a "P". Collect 12 to power up your weapons. There's a bar above your lives that shows you your progress.
And just to be nice, losing a life doesn't clear the bar, it just degrades your weapon by one level.