just some thinking...
There are a number of edugames out there eh, and I do agree the ILO can get in the way-as well as the repetitive nature of the software, kids can switch off quickly.
From what I know, this sounds like an oppt for developing a learning sequence (s)- (practice)-a trajectory that includes progression/continuity:
so, number bonds/add/subtract/division/multiplication/inverse
Something that involves survival (plot) is always a winner-Space Invaders is a nice example-real world probs-mmmm....totally appt for curriculum outcomes but boring for kids to be honest (the more fantasy/blended with real-world objects not situations-the better).
I think simple number configs relating to the above trajectory that are hidden by very simply designed icons-with an interesting plot....and of course a score-card of sorts is all that is needed-the fancier the more elaborate is not always a winner with kids, imho. Rationale, something that looks like and functions like what they might have thought up themselves-so basic cause and effect, they will buy into. And of course next step platform for them to make up their own games with sums to enable consolidation!