Probably you right. I can't reach that platform too.

In 1-6 could you attempt to do the secrect passage cuz i dont know if it leads to anything or what, Im almost certain you need 2 people to get to the top

That level for put the crystal on pedestal (without traps). That will activate one of columns in center ocean. In version 0.71B it doesn't work. In earlier versions - that level was opened when i arrived in the desert.
Waiting for updates/realise game.

What about 1-T3, the lonely island in the ocean? How do you unllock that?

Owh damn! I didn't see.
I totally forgot the first coin in the beginning level, cuz i couldnt get to it.
But thanks a bunch :D

Now stuck at the desert T1 level.
But ill make it

How collect coins you can see on videos.
World 1: 0:20 and 1:51
World 2: 1:21 and 2:10

Thanks a ton!
Only one problem right now, how do i get coins? XD
i can't find any in the normal levels. or do I need more progression?

Yes you need coin's. When you spend coin - door is opening.
World 1:
- open T1 (level 1-4) - https://pp.userapi.com/c638417/v638417011/3d75a/FbEmpEy4lFw.jpg
- open T2 (level 1-9) - https://pp.userapi.com/c638417/v638417011/3d763/KWfjDCRKmCY.jpg
World 2:
- open T1 (level 2-2) - https://pp.userapi.com/c638417/v638417011/3d76c/3OY_ASAtH84.jpg
- open T2 (level 2-9) - https://pp.userapi.com/c638417/v638417011/3d775/S3KvQfOyihk.jpg

how to unlock the secret though?
Do i need coins?
I can't figure it out, i found the 2 secret rooms, but dont know what to do with it.
The first secret in the Desert