I took another crack at it after your post, I figured I was close.. and I was! hehe
I beat two bosses and made it to the overworld, they were fun to beat! I had to redo the fight 3x for the first boss and I got the 2nd one down the first try (probably because I was getting the hang of switching weapons by then). I like the little shield reflector you added in there on the purple boss.
Good to hear that you managed to make it to the overworld! There currently isn't that much to do beyond that point, but there is one more dungeon-like area and boss you can go after if you so desire. Mind you, the town with said dungeon-like area is pretty unfinished.
Also, I'm glad to hear you like the reflector!
I released a new version on GameJolt yesterday.
It adds a few new things, fixes a few things, and is generally best experienced by replaying everything the game currently has to offer from the beginning, as you'll miss most of the new things otherwise.
You can get it here: http://gamejolt.com/games/404_past_not_found/172472