Press the play button to play the next round. Press a button in the shop to buy that tower. Drag your bought tower to where you want it to be, then click it to place that tower. Click on a tower to upgrade it. If you've done all the upgrades you can on a tower, and the upgrade menu hasn't closed yet, press the X button to close the upgrade menu. Press the sandbox button to play in sandbox mode.
This is mostly just a reskin, though some things are slightly changed functionally
