Playable, but unfinished. Very unfinished.
No instructions, no indications what you're supposed to do (the "special" upgrade tree is a bit confusing and guess what - no information what the requisitions are). Only two types of enemies, one map, nice amount of different gems (standard types tho), but no gem upgrading (apart from special gems and levels for frags).
And a sherry on top - only one life, when there's obvious 9 on top.
This game needs polishing, massive polishing. The engine is somehow finished, but graphics, instructions and requisitions are nowhere to be found.
3'd only having in mind, that this is an early beta.

you do have ⑨ lives at start. The enemies just become more dangerous later on costing more lives if they passes through the level. You also can buy extra lives by clicking the "lives" section and then clicking either "buy 1 live" or "buy 5 lives" at the bottom right corner of the screen.

Lol Cirno!

68946 pts and finished all the levels. EASY!!

actually at the home site of gem tower defense there are all the special gem recipes on the same page the game is embedded on,
http://www.gemtowerdefense.com/

instruction tabs and all that too :>

There's a niffy little "cheat" if you buy 5 lives, you get more cash than you pay for it, so you can keep spamming the button ;P

Hmm.. is this a Gemcraft ripoff or an unfinished version of it?

>>>>How do you get the 'great' towers?

nevermind, found out after simple testing... Heh.. Just get 2 'perfect' towers in the same 'pick' of 5 towers, then 'combine' instead of 'keep'.