Correct, but sadly not currently accepted.
Still not accepted -- reported (as with all other instances).
Accepted now (7/16/19)
Isn't おもい the furigana for the verb 'to think' as well?
Correct, different kanji though. 思い as opposed to 重い
When to use omui and when to use omuku
おもい for adjectives and おもく for adverbs.
重いもの (heavy thing)
重くない (not heavy- remember that ない is the negative form of the verb ある)