Only the seeking rockets are a useful weapon. Fully upgraded in the first few levels, and a few levels enemies become imposible to beat unless you do some time-consuming long distance kiting.
Finally a decent unity TD. I don't like that I have to click around already well placed and upgraded towers to toggle between modes, feels like too much hassle for a TD. Also, overall the game needs to have more contrast, I can't clearly distinguish between different level towers. my USD 0.02
1. Make HUGE farm and LIGHT-SPEED humans with 0 life upgrades.
2. Hold spacebar in middle of map.
3. Hit 350 souls, start cashing in the wins while holding spacebar (never release).
4. ? ? ?
5. Profit
Interesting concept. Needs hotkeys. I don't like how the farms take up the whole land. Needs to have some ultimate goal, otherwise would get boring very quickly. As usual, more levels, units, upgrades, etc. make a game more intriguing. Life upgrades seems counterproductive, for the same amount of resources you gain diminishing experience, hence it's better to have more lower level units rather than a few high level ones (well, you need high enough to get gold and stones). I'll be playing some more, keep up the good work:)