Quick answer
Open the official Roblox game, read the current stage and inventory screens, inspect the enemy path before placing, then spend visible in-run Coins only against the first coverage or pressure problem you can identify. Exact prices, farming rates, shop products and trading are not verified.
Chrono Warfare TD is still described as unfinished and in development. This guide therefore treats the live client as the final authority for menus, stage availability and changing balance. It does not infer wave counts, tower costs, damage, enemy health, drop rates or rewards from incomplete footage.