It is often recommended to launch the trainer first, then start the game.
Look for the FearLess Cheat Engine forums or the official MrAntiFun domain. Avoid anything that asks for a "survey download."
MrAntifun's trainer for Alien Shooter 2: The Legend includes a variety of useful features, such as:
: Grants a massive amount of in-game currency to purchase any equipment or upgrades. Infinite Skill Points