This game isn't really original, or above average in any way.
Still, I had fun for a little while, so thankyou.
I see youve made a lot of fairly average games, I think if you focused on quality not quantity you could produce something very good.
This is far too short, the heroes arent useful at any point, theres only one difficulty, the leveling up is entirely pointless since you gain so few levels before finishing the game.
Might make more sense with another difficulty level (like in protector 2) or maybe multiple further difficulties.
All in all though, part 2 is way way better.
 "Lone Space Defender"){kind=icon}
 "Plague 2"){kind=icon}
 "Protector III"){kind=icon}