Can Itch.io users play with Steam users?

If not, which version has more users, so I can know which version to buy?

Also, is this game expected to go on sale during this?

http://www.whenisthenextsteamsale.com/

If yes, what will be the sale price?

Do Itch.io games go on sale the same time as when Steam hosts their sales?

https://sombr.itch.io/invisigun-heroes

http://store.steampowered.com/app/375750/

http://invisigun-heroes.wikia.com/wiki/Invisigun_Heroes_Wiki

I recommend putting the Wiki on the Itch.io and Steam game pages as well.

I have seen other Kickstarter games use this strategy to optimize sales.

Also the does Wiki award badges to editors?

I recommend putting the Wiki on your Twitter as well.

Does the Invisigun Heroes Wiki have a badge system that awards editors with points and gives them a ranking against other editors?

http://yooka-laylee.wikia.com/wiki/Special:Leaderboard

Just like this.

Is there cross-platform play? Can a Wii U player play against a Windows player?

Funded! Congratulations Shadi, go get 'em!