Andor's Trail

As you can see at the screens regeneration is down-counting 264->221, immunity shows same 263. But if I i.e. open/close inventory it will show 220.

That's interesting - are there any temporary immunities in the game so far? I can't think of any, maybe that's why it doesn't quite work. I'll take a look.

Not in the game still, but ATCS allows it...
By the way my hydra runs away to right bottom corner instead of "protect spawn"((( and sometimes it blinks...

the blinking is probably a missing _complete_ tile in Ground layer.
At any time the tiles must cover the whole field. If there are missing or only transparant pixel anywhere, they will produce random blinking.

Your shore is looking nice
Keep one thing in mind, that you can't put walkable objects directly on the shore, because walkable objects need to be in Object layer, otherwise you walk _under_ them. For a shore you need a complete Ground tile and a transition Object tile already.
Big unwalkable or unreachable objects can be placed also in Above or even Top.

Quick update - counters for limited duration immunity should be fixed in the next release. Thanks for the bug report!