i've got a free activation key for this game, to be used in gog. add me

All drivers are latest, Windows is up to date. RTX 4080, Ryzen 5950X, 64 GB RAM.

1. Is Steamworld Tower Defense officially available anywhere? 2. Did any game in the Steamworld series have any permanently missable or promotional content? I want to make sure I can unlock everything or find out if anything might prevent that either because I missed it, or it can't be found in-game. For example, if I need to connect to a different game for a bonus.) 3. Does any game in the series have any platform specific features, even DLC (even if by virtue of being delisted like on 3DS and Wii U) an...

Too drastic a spike, I haven't lost a single battle on Knight difficulty and now I'm 0/2 against Kleidon. Should've been progressively harder up to this point and SOMETHING learnable from 2 defeats other than "attack the little guy only". I can't think of any other game with this much imbalance(they exist, but I can't think of one), but practically all new games have this much lacking of "lesson learning" by way of tutorial or hint. Why are there no hints in videos games anymore? Like; "Kleidon is weak to...

Can anyone tell me if there are any missable achievements that I should be aware of during my playthrough? Thanks.