Cool game! However, if this was your first "learning" project, you might not want to go all out on this one. The more games you make, the more experienced you'll become with designing, balancing, but more importantly, refining and finishing a game. You may wanna polish and balance this to the best of your abilities, finish it, then if you are still determined to expand the game, make a sequel. Even if you stop developing that at some point, at least you have finished something! But however you may choose, good luck with the game!