It's not like he's making you pay get a grip
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Get a life man seriously. Game developers spend hours and hours every day trying to make their vision come true. The assets and hardware needed to make this game will be very expensive and he needs a budget to work with. If you don't have 7 quid, beat it and just watch youtubers play it and stop begging like a 3 year old on JNI's page. Also, all the people that have already bought it will feel ripped off if he suddenly made it free and kept their money. Beat it, kid. Stop whining.
Most developers who sell games for free don't do it full time. Jannik needs the money because he spends most of his time awake coding and he is probably going through a programmer's burnout. You don't see the your window cleaner come round and leave without getting paid.