Liran is a developer. This entails that he works on the game, designing it, making art for it and programming for it.
Sometimes he chooses to reach out.
However, we do not give out rewards simply for getting subs, or making videos. YouTube does that - you can monetize videos from there. We sometimes reach out to YouTubers when we want them to make a video for us of something specific - offering a reward for that.
Liran is aware you're willing to do so and aware you're willing to help. Should he need it from you he will contact you, or possibly I (or someone else in Tacticsoft) will.
Please stop distracting him - if he wants to and has time to he will talk to you. However he is very busy working on the game, creating updates to make it better and fixing problems.
Do you really want him to spend less time on that so he can answer every email he gets mate?
Just play the game, enjoy yourself and who knows, maybe you'll get a nice email or offer.