An entity whose mercy encompasses all things (Quran 1:3, 7:156) cannot be identified as "not good".
An entity who orders Its creation to be good and just (Quran 16:90) can not be identified as "not good" or "neutral".
Allah is just (Quran 53:31, 95:8).
Considering the neutrality between "good vs. evil", a neutral entity can be just, in that sense. However, that neutral entity can't order good. Which leaves us with the fact that Allah is good.
EDIT: "he can't be bound by those attributes. If he is bound by his own creation or something like that then he is not omnipotent."
Your argument is not correct. Allah shares some attributes with Its creation to a degree. Some examples: To exist; we exist, Allah exists too. To be alive; we are alive (before our deaths), Allah is alive too. To speak; we speak, Allah speaks too (in different ways). To make things; we make things (cars, buildings, etc.), Allah makes things too (universes, planets, stars, angels, humans, trees, ... the difference being without needing a tool or material) and many more.