If you could use some of the Tuxcart resources/engine, perhaps a vehicle-based battle game with a garage for customization of your vehicle?

I’d say keep it simple to start. Perhaps a turn-based tactics game like final fantasy tactics advance, or more 3D, like XCOM?

I have no idea where you are getting your information from, but it is certainly not reality. Surveys show that public opinion of the Israeli government is falling steadily across Western Europe, including Germany.

And free speech is protected in Germany, it is by no means illegal to denounce or criticise any government or group.

https://yougov.co.uk/international/articles/52279-net-favourability-towards-israel-reaches-new-lows-in-key-western-european-countries