Helix jump is a very simple game to play (although very hard to succeed at) and as such there isn't any instruction included (or really needed) in the app itself.

If you have questions for how to play the game then you can check out our Answers Page where other gamers should be able to help you. From time to time though there are bugs and issues that need to be looked at. In this case it is a shame that VooDoo havent included any support feature in the game itself.

If you have a problem to report then at present the only way to contact them is via their email:
support@voodoo.io

Their website is at https://www.voodoo.io/ but there is no contact option at present.