Hi RJ — is the first paid commission still open, and would small-palette pixel art fit your app? The potion, gem, key and leaf in my Sprite Color Swap samples show the style; they are project samples, not previous commissions.
My indicative price is US$5 for one simple 32×32 item icon: transparent PNG, one minor colour/detail revision, and nonexclusive commercial app use of the rights held; no exclusive copyright assignment. I can review your brief now and target delivery within 24 hours after we agree the item, reference, scope and terms. Would this style suit you, and would a paid itch.io download work for payment and delivery?