Here are some tips which will help you to defeat your enemies!
How to defeat the Lungfish. When the lungfish blows out yellow boxes, you should hit that box he sucks in. This tip can be applied in the first and second stages. When you are on the last level, you will be by a clam. Punch the shell when he begins to swing the thing on the head. After that, you can punch the very clam.
How to defeat the Brain Tank. When you have to fight this tank, hide behind the pillars. The tank must be in tank form, and you should wait until it shows its bottom. Use this chance and PsiBlast it immediately! The tank will leave the brain, do the ground pound on its top. Repeat it until it dies.
How to defeat bosses or to get no damage. Now, I will teach you how to beat them quickly!
Censor: they are quite easy to defeat! Just don’t focus on them too much.
Shouting Censor: don’t get closer to this demon or it will make a shot.
Personal Daemons: be attentive with them, try to go near them to make them blow up.
Mega Censor: note that you can’t damage it until you shoot all targets. Then this boss will throw balls, now you can shoot at it.