Bomber - heavily underpowered. His eff is a -1 AND he can't attack? Is not a usable card.
Blaster - slightly overpowered. He needs an ATK/DEF reduction to have an effect like that. Other monsters with similar effects have ATK/DEF of both 1400 or less, and he has a 2nd effect those monsters don't have, so he should receive much less stats in exchange for it.
Star Fighter - heavily underpowered. To tribute summon is a -1, then he gets a monster back for +1, then u discard 2 cards for a grand total of his effect being a -2??? Not playable at all!!
Super Destroyer - slightly overpowered. Make it 2 cards max and remember to write "once per turn" and he should be fine.
Return - heavily underpowered. Again, it is a -2 card disadvantage which makes it completely unplayable.
Bond - underpowered. It is completely beaten out by other current cards like Threatening Roar and Waboku.
Creativity: 2/10 - quasi-anime based, almost all eff's are just about destroying monsters, no tuners/synchros, all monsters are 4, 6, or 8-stars, s/t cards have very little creativity in general.
Spelling/Grammar/YGO Syntax: 0/10 - all 3 areas need major work. I think you need to work in general on improving your control over the English language, but you also need to make sure you are following the correct syntax that makes your card texts read the same as real YGO card texts.
Balance: 5.5/10 - needs major improvements. See what I wrote at top half of post.
Pics: 2.5/10 - most pics are unoriginal from Gundam anime. Many pics have solid backgrounds like black or white that look just awful on cards.
My Opinion: 2/10 - I know you probably tried here, but you need a lot more work in many areas to improve these cards. Better luck next time.
Final Rating: 2.4/10