Nice game! Love the action packed quickness from start to finish of each match! Let me list some things I think need attention:
The clicker aspect is kind of unnecessary, as there isn't really a time where clicking is all that efficient aside from the early game, or level 5. Might I suggest a range increase with its upgrade? The single unit clicking isn't very rewarding, and isn't strong enough to really deal with the Behemoths+ that well. A range increase to help your weaker units against multiple attackers would be nice in the mid-game.
As the previous player mentioned, the tank AI could use a bit of tweaking. Some times they sort of just head in the direction the nearest enemy is, with no regard to their base getting destroyed. Would it be possible to get a "Hold Position" button? That way the act of moving them and positioning them would provide a much more realistic sense of Defense during the waves levels, as well, there's no need for Howitzers or other long range units to endlessly push forward ahead of the Vanguard.
For the turrets, I like that there are tanks to out range them, as if not then you could essentially just tank up all game and that would get boring. Could I suggest giving them a bit more health or shorter build time? Having a building get sniped from the across the battlefield mid-line before they are even crafted is a bit annoying.
The booster packs are nice! However, for the 1000 gold pack, I feel it should give more, perhaps 5 or more additional blue units. 1000 gold is pretty pricey for a one time use Goliath that doesn't really hold up too strongly on their own by level 8.
That said I think you have a very fun project coming together here. From the design of the tanks to the aspect of crystal miners in the south, I think this game has great potential, and I wish you the best moving forward if you do decide to continue developing it 👍