I’m not seeing pkgman expose that information anywhere. If anyone has a secret parameter, let me know.
While we’re on the subject, pkgman search really could use a -b option. B for bare, where it just gives the package names with no flags, no short descriptions, no padding. Like ls -b -1.
Was looking for that information earlier also without finding it, maybe @BiPolar can help out here, he’s the pkgman guru 
You can get just the names by running the output of pkgman search through something like cut -c -40, but it doesn’t trim the blanks. However using awk ‘{print $1}’ as a filter works perfectly.
AFAIK, the “repo” files that pkgman uses do not currently contain information about package sizes, and no secret parameter to help us.
I’d like to have that info avaiable, and already have it in my (generally overly-ambitious, considering my skills) ToDo list for pkgman. At this pace, I might have something to test… around R2 
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You need to understand that while a game might look basic graphically, that doesn’t mean it will have low hardware requirements. Minecraft is still a modern game, poorly optimized, and it relies on OpenGL. Without a fast CPU and a GPU with 3D acceleration, it will run very poorly. Performance also isn’t the only problem with lacking or missing GPU drivers. You also need GPU drivers for things like:
-Vsync or Freesync (preventing screen tearing)
-Being able to select your monitor’s native resolution
-Connecting more than one monitor
I would suggest that you go with a “safe” option for your son, at least for now. If you’re looking for an open source OS, Debian’s “stable” release should work fine for most use-cases. Once he is more comfortable with computers, you can try and introduce Haiku to him, while making sure that he knows that Haiku is a work-in-progress.
Thanks @x68k all good advice. My attempt has been thwarted due to my Haiku Instal refusing to finish downloading any large files (small ones no problems). It just downloads 300MB or 500MB then HaikuDepot just sits there. Heaps of diskspace, so the reason is not obvious to my skill level.
The HGC attempt was always “look at this curiosity” based on what an end user could cobble together from what is available on HaikuDepot, not expecting groundbreaking gaming. Classic Cube is faster at 40 and 120 FPS than on his Xbox and is playable, and even has a red/blue 3D option that will provide some amusement to compare with our proper 3D set up! My hash-up console like interface just didn’t happen, because none of the launchers allows easy reformatting into a console arrangement (just fun aesthetics and non-user friendliness as functionally I hate consoles).
Yes he and his sister have always low end gamed on Linux from vanilla to Batocera, but that is Linux and another story. Contrary to opinion here, I do not think the route through Linux is necessary, just typical. As for gaming YES it is the best route, because it just totally works on Linux nowadays.
There is some impressive stuff going on here that “gamers” are doing and it is sad the hardware support is not there for what otherwise would be a great gaming platform IMHO. In my case I wanted my children to catch “the game of getting a computer to do great stuff” bug by gaming leading them to thinking “I can make it better” which Minecraft encourages All good and Thanks
EDIT: I have found “EASY game scripting” with LUA by BeSly Software Solutions. Since LUA is used in some pretty big name games it looks interesting as a way into gaming and programming. Anyone care to comment on how “Easy” it is. How much experience and minimum age do you recommend?