Just a little something i came across whilst doing a bit of research. Take a look at this, Voodoo are clearly smashing the appstore to pieces - you may need to translate it to English https://omr.com/de/voodoo-hypercasual/
I kinda feel sorry for the developer of Helix Jump. He probably signed the standard contract for X amount of money - which is still very good but could of made millions more in revenue. I guess the counter argument would be is if the game would have gone viral without Voodoos help?