could use a lot of work
I understand that this is supposed to be retro, but the graphics need to be updated. Keep the retro game play but don't have everything looking like it took 10 seconds to throw together.
There is no purpose for lives so just remove them, you lose them all and then you just continue on at the same level(and lose points, but there's also no point in them). When the gems fall on you, you should collect them, not have to run up into them. The transition between the levels is too long, speed it up. When you die on a level, the required gems is not reset, so all gems collected on your first try are added onto your next tries, but those gems have also respawned.