Of the three I'm intrigued by Chicken Invaders 3 to have a look at the demo, while Bullet Asylum is very much an acquired taste, but again, if the demo is something you enjoy, then the discount makes it easier to make the purchase decision.
BulletAsylum delivers over-the-top action, melding classic gameplay with next generation visuals and mechanics. With an insane amount of firepower at your fingertips, vibrant graphics, and an all-you-can-shoot buffet of alien hordes to destroy, BulletAsylum will blow you away.
(You can also read the AAWP review here)
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Chickens. For centuries we have oppressed them, grilling, roasting, stewing, and stuffing them in buns. The time has come for us to pay. Intergalactic chickens are invading Earth, seeking revenge for the oppression of their earthly brethren! It's time for you to fight for our ancestral right to omelettes. Will you succeed? Will the future of chicken burgers be secure? Or will you end up as part of the menu in a galactic chicken restaurant?