There are still many more things you can add to this game to make it even more adventurous.
You may notice that the enemies can kill themselves when they fly into the sword while it's still lying in the maze. Can you think of a way to fix this bug?
Perhaps you'd like to improve the graphics or create an actual storyline. This would make the game look different at each level and improve the sense of an adventurous journey.
You can also add other enemies or more weapons to use during the quest.
Perhaps it's not such a good idea to reward the player points automatically on completing each level. It could be a lot more fun to fight for them. How about including gems and other treasures that are worth points?
Either way, it should be as much fun for you creating the adventure as it is for the players to play it. Be imaginative and make this adventure your own.