No saving is a huge turn-off. How long does a play-through take?

Progress on the current island will be lost, not 'progress of this playthrough will be lost'.
edit: this pops up when you choose the 'save & quit' option while playing. Watching videos yields helpful information, it seems :)

The Dev said on Steam that the release version would have a save function so you don’t need to play the game in one session.

This helps! Thank you!

Looks like more of a mobile platform title. Dunno if I want to play it one any of platform though =/

I have the game here on GOG and can confirm that there is the option to "Save and Quit".
You do loose your progress on the island you're currently on though but as I'm on the first island still I can't say how that influences the game overall.

Ha! Back in my days, you played Pacman, Space Invader and Cobra on your Atari 400, without saving anything, not even your highscore, and you loved it, dagnabit!

(Well OK, the "good old dayse" were somewhat crummy ^^. But nostalgia goggles aside, I think we can agree that there are, or at least were, saveless computer games. It's just that it's usually not in the semi-RPG department)

After testing the save feature, here is how it works:
When you continue the game after "saving" and quitting , you start again at the beginning of the island that you were last on. Everything you did on that island is gone. So if you did something, you will have to do it again.
You can't go back to islands you visited previously.
Crew you brought with you to the new island is still there with you.
It's a bit similar to how days work in Stardew Valley. The "savepoint" in Lost Sea is when you arrive at a new island.

The release report says, "now available for Windows and Mac OSX", whereas the system requirements state, "Windows (XP, Vista, 7, 8, 10), Mac OS X (10.6.8) and Linux (Ubuntu 14.04, Ubuntu 16.04)".

So, is it available for Linux or not?

Absolutely right, we had no saves, only a few games had 'memory' saves which means , quit game, saved position gone cause the game was shut down.
I like casual games and the screenshots look like scenes from a casual game, but, and this is a major but, the graphics are weird vector/voxel, tbh i hate graphics like these, the colors are overdone, looks more like a girls my little pony game with all those bright and overdone colors.
The worst part is the movent, after checking a few seconds of some play videos on youtube i could'nt take it anymore, too much rotating and moving and, well its a mess imho, if this would have been more like a decent casualgame i buy it but is is not.

Anyway i read the only 2 reviews and i agree 100% with the first one: A very disappointing experience and 2 stars is imho to much, palying games > 40 years now, so i know what is bad and wat is sad, this game is both, bad and sad, the worst part is , more games like these are coming by the dozen and fill up the virtual shelves on gog, more games is always okay but what would be the use if we had lets say 5000 games and 75% of it would be 'junk'?

Take Steam for example : Steam has :>12K games (including dlc i guess) and at least 70% of it (maybe 85% or more) is junk imho.

So quality is always better then quantity, i'd rather have a choice of only 500 quality games then 100K (thats a lot of games) of quantity games , which also have a ridiculous pricetag.

If bundles like these would arrive:(steam(drm loaded)drm free ofcourse:

Buy Animation Arts Bundle : list price: 46 euro :Includes 6 items: Lost Horizon, Lost Horizon 2, Secret Files 2: Puritas Cordis, Secret Files 3, Secret Files Tunguska, Secret Files: Sam Peters

This would be a instabuy, that would be 7.69 EU a game which is a very good price.

I would even by secret files 1,2,3,4 at 46 euros, (thats 11,50 a game) and only 4 games, because i like these games
they are old and prove to be worth something at least. :D

Most new games are bad, expensive, and require a mega PC

I know that this game was ported for PC, but is it that hard to implement a rebind your buttons feature?
I thought of getting the game, but since I don't own an gamepad and finding that I can't rebind my keys that's a NO for me.