Is this game a work in progress? Cause in case it is, this review will not be justified...
But since you uploaded it on here, the faults:
No proper instructions; You only know how you control the bird (and even that you only know from reading author comment) and that you're supposed to destroy enemy bases.
Hard and broken like you didn't even play the game; The mobs that spawn stay there even after you die - so if i'm trying to destroy their spawner (which is pretty impossible on its own) the cannons will overflow me on my next try.
It's an average looking game with a low grade design and as such doesn't deserve more than 1.5 stars IMO