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.

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Ha, I found this very amusing expecially with the old Nintendo style graphics, huge childhood flashback while playing Duck Hunt. Great Job!

Cool

Fun game, but am I suppose to be able to climb the sky?

Impressive!

I never played an official game and this is just WOW!

I only dislike the map overview.

The game is well developed, overall. It's entertaining and fun. The one thing that got to my nerves while playing was the mandatory map overview before starting any level (even if it's restarting it). I'm not saying it's a bad thing to do, but it should be skip-able and should only show the part of the map that's playable (it just keeps going around the whole map even showing the area you cannot get to).