Wow this gives me ahuge vibe of I Wanna Be the Guy! The gameplay is fluid and sweet, even a boss battle at the end too! I like it very much!
For some criticism I'd say the boss battle itself have too much downtime, I'd rather the fight be more difficult but you instantly get back to the action, rather than waiting for 30 seconds or so to start avoiding attacks again. Also, please have fast forward in the dialog box, I think the level is so short that you can basically completed all levels during the character talking. It's a waste of good text to be honest.
Anyway, you've done a good job in a single week with this game!