Some quick points:
- Graphics reminded me of those flash games from 2004. Hit me right in the nostalgia!
- Music was ok, but there was no sound beside it. To get free sounds use sites like freesound.org. Really helps with player feedback
- You didn't reset the score the the start of each round, so my score (4th at the time of writing) was collected during four rounds.
- What's impressive here is that you got proper enemy navigation in platformer in three days! Kudos!
Over all- pretty good, but it would be nice for you to have more time to develop this one!
Keep up the good work!