Found some bugs. (I'll comment here instead of messaging Intrapath)
1. When I first opened the game, I went to the level editor and tried to change the music. I clicked the right arrow and the song title still said welcome, and then I clicked the left arrow and the song title said "UNDEFINED". I've been unable to reproduce this, so it may have something to do with changes in persistent state that now prevent the bug from occurring.
2. Any time you enter the level editor, the song title says welcome and then still says welcome after clicking the right arrow even though the music changes.
3. Clearing save data does not reset the unlocked songs so all songs remain unlocked.
4. When you start a level, it doesn't say which character is active until you press the switch button. It just says "ACTIVE: -"
5. In one of the levels the text box didn't even say "ACTIVE" at all and just remained completely blank for the whole level. Sorry, I don't know how to reproduce this.
6. The level title text changes the mouse cursor to a text input cursor. I suspect this is because the level title can be edited in the level editor.
7. The text input fields in the level editor can't have text selected with the mouse. You can select text with the shift and arrow keys, but the mouse can only be used to change the position of the text input cursor.
8. When you click on a tile type to change your active tile in the level editor, and then click on the main menu button and then click yes, that active tile remains visible over the main menu.
9. The music controls (play/pause and the left button) are clickable when they're invisible in the dialogue cutscenes.
It looks like you're using Flash and ActionScript. Several of these bugs have to do with layers and mouse events, so I can tell you a few ways you can approach fixing them. If you want to cover up your buttons with a huge rectangle to make them invisible, you have to make sure the rectangle is mouse-enabled so it can't be clicked through. If you want to make sure an object can't be clicked on by using the mouseEnabled property, remember that there's a mouseChildren property as well. But I think the best solution is to remove unfocused game screens from the stage entirely by using removeChild.
Apart from bugs, I do recommend including a level select screen that shows which levels have been one-hundred-percented for those players who want to get the medal :)
EDIT: Also there are typos in the dialogue. It says ect ect instead of etc., and some of Capy's lines have a space at the beginning.