Well I'll gladly answer any questions.
I didn't include a skip the tutorial feature. I am running low on tokens so I am not sure how much I can still fit in.
1) To avoid a 4+ battle it checks to see if there are the appropriate tiles flagged around it. If the Kraken tiles are flagged the 4+ warning does not trigger.
2) I have been told about the void clearing. I opted not to do this as the game screen is only an 8x8 grid so I thought it would be too easy to empty a flood of tiles.
3) Red gems double your attack strength
4) The targets are just visual aids on whose turn it is.