A space game (with blackholes)? A simulator like Universe Sandbox, or a turn based RPG, or a space battle game. Maybe you could use "black hole" figuratively and do a game about something that drains the player out of something. There's quite a few possibilities there!
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If you haven't found out already, you can disable filtering in the Import tab after clicking the texture and disabling the Filter checkbox and clicking Reimport. There used to be a project-wide setting for that but I can't find it in 3.0.6... But the antialising is from the icon itself actually.