What are some alternatives?
When comparing Nun Attack and Sci-Fi Heroes, you can also consider the following products
Battleheart - Create a party of heroes and lead them in frantic real-time battles.
Battle Heroes - ttle Heroes is an addictive real-time strategy game packed with actions and intense combats.
Brutal Street - The most bloody gang war has started! A new style ARPG is coming!
DEAD TRIGGER - The world has collapsed.
Kingdom in Chaos - A magical RPG world of adventure awaits you. You will meet heroes and goblins, friends and foes!
Feedy.io - Best alternative to Agar.io.