For the hard level, try decoy drones + dual machine gun, upgrade dam once on dual, then rate of fire, upgrade to machine gun drones and then mostly health of drones with some health elsewhere. It's easy.
Needed: Multiple Unit Control
Some degree of strategy rather than grindfest (approx.3 diff strats actually work. Well done).
To be less dull. (Battles should be faster, less hp and more damage from both).
Realistic physics? Really not. Also, the game is too easy in some parts, too hard in others, and feels entirely random. The obstacles don't hinder you at all and sometimes accidentally help you score more pointless random goals. Crap, 1/5.
No-one ever thinks about laptop users designing games. This game is probably the least touch-pad friendly ever, losing it a mark from 5-4, Then playing it on a friend's computer it was a little dull and more could have been done with the tail, so down to 2, finally the music is dire twinkly rubbish, concert lounge standard. What's that, 1/5? Yeah, and deserves it.