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The bar spacing would be ok but as you have the alaska you'll know there are bigger gaps at the top & corners, when I kept a Chinese ham in the alaska I used cable ties on those larger gaps just in case!
I think the biggest problem with this cage for robos is the height as they will try to climb the bars & there's a fall risk so I wouldn't really recommend it.
There isn't really another option as cheap as the alaska but there is the Savic mickey large, it's very much like the Hamster Heaven cage with a lovely big door but with narrower bar spacing & doesn't have the useless penthouse thing! You can't use the metal shelf that comes with it but then most cage accessories are pretty useless so I don't think that's such a big deal.