No, this is nothing like a real gacha game at all. Gacha games have a wide variety of mechanics, and can have significant depth to them. Trading card games were the original gacha games, and those have entire competitive scenes with tournaments, etc. (Magic the Gathering, Yugioh, Pokemon TCG). Digital gacha games are similar. In a real gacha game you aren't rolling for a static number, you're rolling for a package of numbers and modifiers and mechanics that feed into a complicated combat system, and there's tons of strategizing around how you combine different packages of numbers together in deckbuilding/teambuilding, plus the decision-making in the battles themselves.

Gacha is really just a monetization approach. The mechanics that accompany it are the real draw, and you can have card games, RPGs, tactics games, action games, etc.