i always upgrade to Tier 3 but im glad you found your own style :)
pyro
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i can see that youre spending the third (last) currency on upgrades instead of merging into tier 3 unit, always get a tier 3 unit and upgrade it as much as possible,
i dont have any problems winning with radiation / explosion / ray but thats probably because i know what to do, youre really close from getting into the part where you say "thats all they can do?" :D because tier 3 units get really OP really fast when done correctly
theres two buttons labeled "merge", one is for merging tier 1 units, and one is for merging tier 2 units
once you click the button, you need to select 3 units, either by clicking at them directly, or in the unit list.
when the button says 3/3, you can click the button next to it to buy the upgraded unit (if you cant afford it, you cant finish merging)