Completely completed in...15minutes, well its a really nice concept and i think and hope, that this game was kinda a test and you're expanding in in other games.
Otherwise... Far too less and too boring upgrades:
Stonewall and bubblewall do EXACTLY the same(only that an enemy, dumb enough to throw directly down might be hit by bubble) and the only USEFUL skills are healing and fire. Freeze only if you want a rest :)
My strategy:
prepare a powerful 100-100-100 potion for emergeny cases. save.
Then create a 25-25-25-potion-red fire not this easy to control, but no enemy, but giant will be able to pass it alive.
30-25-25 is blue fire, seems to be more effective to red spiders and white skeletons.(But it doesnt really matter, they won't even pass 25-25-25.
When you hear a with laughing, increase the blue factor to 50-80, when you detonate the potion close to the witch, it will die immediately.
When a giant appears, 25-25-25 is also enough, but if you use to miss, better increase it a little to have bigger range, with this tactic, 10 giants would be no problem(just a problem of lag.)
1.Physically a missile, thrown 5 seconds ago, should be falling faster than a tank jumping down just now.(Arr gap, must hit this missile, its falling faster than...aww crap!)
2. The Levels are fail.(nununu hole must hit this bullet... awww crap, seeker.)
At least the bosses are easy :)
(No dont flame me about last boss, it's clearly much easier than the level before him. C'mon! Pushy lasers? YOU CALL THAT BOSS?)
Noticing that the enemy escapes i just crashed it.
Good idea because: I'd have gotten 6stars for it and the monny.
Bad idea because: It was frenetic mode and the enemy had a wall of plazma bullez in front of it :/
This game is really not user-friendly. If the enemies fall off it'll take 4 seconds to win. If one of your guys touches offscreen you immediately lose. Even if he returns(!)