How to play in fullscreen?
Alt + Enter
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As for the update argument, it always depends what is being promised. If the dev is up front and is like "I can't do this atm, it might take 6 months or a year for the next update, it will only be this much content for an update" and so on, and tells people not to support him if they don't have the money to throw away then I think its fair game, thats transparent and fine.
Now on the other hand, if all this information is NOT put out, then yes, he is ripping people off. There are developers here that will contantly delay updates by multiple months and bit like "development has been slow because covid, personal drama, whatever" or they don't even offer an excuse and just say "we try to make the game as good as possible" and then on the other hand guilt-trip patrons into paying by saying "this many updates wouldn't be possible without having the financial support" and "budget has been a bit low the past few months, its hard to work under these conditions". And that is atrocious tbh.
Its fair game if the dude is working full- or part-time in addition to this, has a family he has to take care of on top of that and warns patrons that this is the case. People who still pay either can afford it very easily or are just dumb.
That is my take.