Congratulations on your first game! I agree with what Lunatic Dancer says, that the game itself isn't much but there's always room for improvement. I also second their suggestion of Game Maker Studio (specifically 1.4 if you can find it, since I've heard the free GM:S 2 has some major drawbacks), since I've always felt it was easier to use. For example, collision can be handled entirely by simple drag-and-drop actions if you want. I'd still recommend learning Unity since it uses an actual programming language (GMS uses its own, dumbed-down language), but I would start with Game Maker.