Ben 10 Power Splash:

Gwen has been kidnapped by Ben 10’s enemies and your objective is to help Ben to go after the evil goons and rescue his girlfriend from them. Use the keyboard arrow keys to move and press the spacebar button to attack. Avoid all the dangers and collect the green power ups for energy boosts. Some evil thugs captured Gwen and trying to run away in a speedboat and you have to help Ben to stop them by transforming into mighty alien forms to rescue Gwen.