Maybe his domain would be Creation, and his portfolio would be space? For simplicity's sake.
Honestly, the more i think about it, the more I realize that he would be just as potentially powerful as Vowzra would be...
Would it be better for me to just go with God of War(Honor)?
I do think that space is in fact a portfolio, and I do think it goes under the domain of creation - but the real issue is actually understanding what kind of power 'space' gives.
I struggled to come to grips with the creation domain, and the portfolio of time is one that can easily become over-powered or, if you're paranoid of being OP, under-powered. As Vowzra was initially a god of Space (Time) (though strictly speaking that makes no sense) I can tell you that space, generally, is a difficult thing to come to grips with. I'm personally keeping away from it, and I'd advise anyone wishing to create a god to do likewise.
I had another character, in a Bleach RP, whose power was centred around Spacetime, and all it really came down to was his ability to open portals. I have no idea what else you could actually do with 'space' or 'time'.
I have no issue with you choosing to be a creation god, but the whole space thing, I can confidently tell you, will be a nightmare. Do it if you feel you're up to it, but otherwise you might want something that is less ambiguous. That's my 50 cents.