Guard the Hole V1.0

This is not a standalone executable but a project for the Construct 2 engine (https://www.scirra.com/construct2/releases) Guard the Hole is the simplest form of a tower defense there is: you have basic circles heading to a goal protected by guns. I made it this way to be a game small enough to fit possibly on a flash drive, so that people have a simple game to play while people arent watching. This is also the first game I made, so please give me all the criticism you can, good or bad will help, thanks :)