Not that great of a game. No story, no challenge, no strategy (that you need to use), AND locked content. 2/5 IF you want to make this game better, or make a sequel, try to include better content such as: Map Maker, Pause, find what combining two gems will get you BEFORE combining, better interface (drag and drop doesn't always work so well), choose difficulty, better variety of enemies, and perhaps rare "super gems". Some glitches that were common within the game were: water trenches not working, splash damage not hitting other enemies, poison wearing off instantly, armor levels going down then back up (purple gem), and mana not being effected by an enemy getting into your base. I would like to applaude you on the gem system though, very imaginative.
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