Three resource habits that saved my runs

In tower defence and strategy alike, your economy decides the match before the enemies do. I used to sit on a pile of coins waiting for the perfect moment that never came. Now I spend early and steady.

Habit one: invest in a couple of strong lanes early rather than lightly reinforcing everything. Early kills snowball into more income, which funds everything else.

Habit two: keep a small reserve, never a huge one. Enough to react to a nasty wave, not so much that your map is under-built when it hits.

Habit three: upgrade before you build new. A fully-levelled existing tower usually beats a fresh one you can barely afford. Depth over breadth, almost every time.